FORCES & MOTION 4.1 THE STUDENT WILLUSE EXAMPLES TO EXPLAIN
THE CONCEPT OF INERTIA IN EVERYDAY SITUATIONS. 4.2 DESCRIBE THE
RELATIONSHIP BETWEEN MASS AND GRAVITY. 4.3 DESCRIBE THE FOLLOWING
INTERACTIONS: SPEED, VELOCITY, AND ACCELERATION. 4.4 DRAW AND
INTERPRET DIAGRAMS AND GRAPHS REPRESENTING AN OBJECTS MOTION. 4.5
DESCRIBE THE FOLLOWING FORCES: GRAVITY AND FRICTION. 4.6 PROVIDE
EVIDENCE TO DEMONSTRATE THE RELATIONSHIP BETWEEN FORCE AND MOTION.
P8B1 STUDENTS KNOW THE EFFECTS OF BALANCED AND UNBALANCED FORCES ON
AN OBJECTS MOTION. 4.7 IDENTIFY THE FORCE(S) ACTING ON MOVING AND
STATIONARY OBJECTS. 4.8 DETERMINE THE NET FORCE ON AN OBJECT GIVEN
A DIAGRAM. P8B3 STUDENTS KNOW EVERY OBJECT EXERTS GRAVITATIONAL
FORCE ON EVERY OTHER OBJECT, AND THE MAGNITUDE OF THIS FORCE
DEPENDS ON THE MASS OF THE OBJECTS AND THEIR DISTANCE FROM ONE
ANOTHER. 4.9 DESCRIBE THE RELATIONSHIP BETWEEN DISTANCE AND
GRAVITY. 4.10 EXPLAIN THAT EVERY OBJECT EXERTS GRAVITATIONAL FORCE
ON EVERY OTHER OBJECT.
Slide 2
ENERGY 7.1 THE STUDENT WILL USE AN OPERATIONAL DEFINITION OF
ENERGY. 7.2 THE STUDENT WILL DEMONSTRATE THAT ENERGY CAN BE KINETIC
OR POTENTIAL. 7.3 THE STUDENT WILL INVESTIGATE ENERGY AS A PROPERTY
ASSOCIATED WITH MATTER. 7.4 THE STUDENT WILL DESCRIBE DIFFERENT
FORMS OF ENERGY (MECHANICAL MOTION). 7.5 THE STUDENT WILL DESCRIBE
VARIOUS ENERGY TRANSFERS WITHIN A SYSTEM. 7.7 THE STUDENT WILL GIVE
EXAMPLES OF ENERGY TRANSFORMATIONS.
Slide 3
Bellwork- Wednesday 12/7/11 Identify the type of friction shown
in each diagram. Sketch the pictures and draw arrows to show the
direction of friction. Sliding Friction Two solid objects rubbing
on each other. Rolling Friction Two solid objects; one rolls over
the other. Fluid Friction A solid object that rubs against a fluid
(liquid or gas).
Slide 4
MythBusters: Phone Book Friction Continued What has happened so
far? What do you predict will happen? Will Adam and Jamie be able
to separate the phone books? Myth Busters Video Part 2 (6 m 30 s)
Air Resistance Videos What happens when there is no air resistance?
Why? Hammer and Feather on Moon Video (47s) Ball and Feather in
Vaccum Video (20 s)
Slide 5
Forces- page 13 P8B1- TSW KNOW THE EFFECTS OF BALANCED AND
UNBALANCED FORCES ON AN OBJECTS MOTION Force - a push or pull Unit:
Newtons (N) May change the motion of an object Forces can be
represented by arrows The size of the arrow represents the
magnitude (strength) and the point shows its direction Newton -
unit of force 1 Newton is the force required to accelerate 1 kg of
mass at 1 meter per second, per second (m/s) Net force- overall
force after all forces on an object are combined together forces in
the same direction combine by addition forces in opposite
directions combine by subtraction
Slide 6
Combining Forces In which direction is the net force? + = =0
(balanced) = =
Slide 7
Bellwork- Thursday 12/7/11 A skydiver falls faster and faster
through the air. Eventually her velocity will a) increase b)
decrease c) remain constant How can you explain this? Terminal
velocity- maximum (constant) velocity a falling object reaches; no
longer accelerating; air resistance = gravity A cowboy drops his
gun while riding his horse at a fast gallop. In the absence of air
resistance, where will the gun hit the ground relative to the
horse? a. In front of the horse b. Behind the horse c. Next to the
horse Why? Gravity pulls gun down, but it will also continue to
move straight forward with the same velocity as the horse (inertia-
1 st law of motion). There is no air to push it any other way.
Slide 8
Page 8 Distance-Time & Speed-Time Graphs 1. A, E, F 2. D 3.
B, C 4. E 5. B, C, D, E, F 6. F 7. 2.5 y/s; 5 y/s 5 y/s; 2.5 y/s 5
y/s; 7.5 y/s 2.5 y/s; 2.5 y/s 7.5 y/s; 2.5 y/s 8. Constant speed 9.
Coming back & Constant speed 10. Stopped 11. Speed Decreasing
12. Albert 13. Charlie 14. 5 seconds 15. 14 seconds 16. 100 m/12 s
= 8.33 m/s 17. Accelerating 18. Slowing down 19. Constant speed 20.
Stopped 21. Accelerating 22. Constant speed 23. Decelerating 24. At
rest 25. Accelerating
Slide 9
Balanced forces - equal forces acting in opposite directions
balance each other; they will not change the objects motion; net
force = zero Unbalanced forces - cause an object to start moving,
stop moving, or change direction 100 N 60 N Net force is 40 Newtons
to the right Net force
Slide 10
Slide 11
Ground Gravity Applied Force Rolling Friction
Slide 12
True or False? More than one force can act on an object at
once. TRUE. Forces that act in opposite directions combine (add)
together. FALSE. In this case the two forces would act against each
other. To find the net (total) force on an object you should add
all the forces on an object together? FALSE. The strength of the
net force is the difference between forces acting in opposite
directions, and the combination of forces acting in the same
direction.
Slide 13
Bellwork- Thursday 12/7/11 A skydiver falls faster and faster
through the air. Eventually her velocity will a) increase b)
decrease c) remain constant How can you explain this? Terminal
velocity- maximum (constant) velocity a falling object reaches; no
longer accelerating; air resistance = gravity A cowboy drops his
gun while riding his horse at a fast gallop. In the absence of air
resistance, where will the gun hit the ground relative to the
horse? a. In front of the horse b. Behind the horse c. Next to the
horse Why? Gravity pulls gun down, but it will also continue to
move straight forward with the same velocity as the horse (inertia-
1 st law of motion). There is no air to push it any other way.
Slide 14
One person pushes a book with a force of 20 Newtons left. The
other person pushes the book with a force of 18 Newtons right. Are
these forces balanced or unbalanced? Would these forces cause the
object to move? If so, in which direction? How can you tell? What
is the net force? Unbalanced The object moves left. The magnitude
of the arrow pointing left is greater. 20 N 18 N = 2 Newtons Net
Force = 2 N 20 N 18 N 4.7- TSW IDENTIFY THE FORCES ACTING ON MOVING
AND STATIONARY OBJECTS.
Slide 15
Two people push on the book with the same strength (one 20 N
left, and the other 20 N right). Are these forces balanced or
unbalanced? Would these forces cause the object to move? If so, in
which direction? How can you tell? What is the net force? Balanced
The object would not change its motion. The magnitude of both
arrows are equal, in opposite directions. 20 N 20 N = 0 Newtons In
this case the two forces would exactly cancel each other out. Net
Force = 0 N 20 N
Slide 16
Two people push a book in the same direction. One person pushes
to the right with a force of 8 Newtons; the other person pushes to
the right with a force of 6 Newtons. Are these forces balanced or
unbalanced? Would these forces cause the object to move? If so, in
which direction? How can you tell? What is the net force?
Unbalanced The object moves right. The arrows in the same
direction, so they combine/add together. 6 N + 8 N = 14 Newtons Net
Force = 14 N 8 N 6 N
Slide 17
4.8- TSW DETERMINE THE NET FORCE ON AN OBJECT, GIVEN A DIAGRAM.
Combine the forces to find the net force in the appropriate
direction.
Slide 18
4.8- TSW DETERMINE THE NET FORCE ON AN OBJECT, GIVEN A DIAGRAM.
The arrows below show forces acting on an object. Use the diagram
to answer the following question. What is the net force on the
object and in what direction would the object move? What action
would be necessary to balance the forces? Add a force of 50 N to
the right and add 25 N downward. Subtract 25 N downward and add 25
N upward. Add a force of 50 N to the right and subtract 25 N
downward. Subtract 25 N to the right and subtract 25 N downward.
100 N
Slide 19
A force of 100 N is applied to the right on the wooden crate,
and a force of 250 N is applied to the left, draw a force diagram.
What is the affect of the forces on the wooden crate? a) The box
moves straight up. b) The box moves to the right. c) The box moves
to the left. d) The box does not move. What is the net force? 150
N, left A bus is driving and has an applied force to the right of
1000 N. As it approaches a bus stop, the brakes apply a friction
force of 1000 N to the left. Draw a force diagram. Will the force
stop the bus, or will the kids get left there? Why/why not? No!
Balanced forces = constant speed = kids will get left there! 100
N250 N 1000 N
Slide 20
Force (Free-Body) Diagrams- pg 14 Free-body diagrams - used to
show the size (magnitude) and direction of all forces acting upon
an object in a given situation The object is normally drawn as a
square, with the forces all pointing outwards from the center.
Shown is an example of a free body diagram. Notice the arrows are
drawn and labeled to indicate the force they represent. What do
they mean? F frict Force of friction F grav Force of gravity F app
Applied force F norm Normal force
Slide 21
F frict Friction Force The force exerted by a surface as an
object moves across it or makes an effort to move across it; two
types: kinetic (sliding, rolling, fluid) and static friction F grav
Gravity Force Directed "downward" towards the center of the earth F
app Applied Force Force which is applied to an object by a person
or another object F norm Normal Force Support force - exerted upon
an object which is in contact with a stable object F net Net force
Sum of all the forces acting on an object; in the direction the
object moves When net force = 0, there is no movement/no change in
motion F air Air Resistance Force Fluid Friction- This force will
frequently be neglected due to its small size; It is most
noticeable for objects which travel at high speeds
Slide 22
Find the net force by finding the sum of the forces acting on
the object. 400 N 200 N 20 N 5 N 0 N 15 N 0 N
Slide 23
Calculate the missing forces that yield the expected net force.
A = 50 N (the horizontal forces must be balanced) B = 200 N (the
vertical forces must be balanced) C = 1100 N (in order to have a
net force of 900 N, up) D = 20 N (in order to have a net force of
60 N, left) E = 300 N (the vertical forces must be balanced) F = H
= any number you wish (as long as F equals H) G = 50 N (in order to
have a net force of 30 N, right)
Slide 24
Free Body Diagrams A vase is at rest on a table top. Diagram
the forces (2) acting on the vase. An egg is free-falling from a
nest in a tree. Neglect air resistance. Diagram the force (1)
acting on the egg as it is falling.
Slide 25
A flying squirrel is gliding from a tree to the ground at
constant velocity. Consider air resistance. Diagram the forces (2)
acting on the squirrel. A car is coasting to the right and slowing
down. Neglect air resistance. Diagram the forces (3) acting upon
the car.
Slide 26
A skydiver is descending with a constant velocity. Consider air
resistance. Diagram the forces (2) acting upon the skydiver. A
force is applied to the right to drag a sled across loosely-packed
snow with a rightward acceleration. Neglect air resistance. Diagram
the forces (4) acting upon the sled.
Slide 27
A rightward force is applied to a book in order to move it
across a desk at constant velocity. Consider frictional forces.
Neglect air resistance. Diagram the forces (4) acting on the book.
A rightward force is applied to a book in order to move it across a
desk with a rightward acceleration. Consider frictional forces.
Neglect air resistance. Diagram the forces (4) acting on the
book.
Slide 28
A lacrosse ball is moving upwards towards its peak after having
been cleared by the goalie. Neglect air resistance. Diagram the
force (1) acting upon the lacrosse ball as it rises upward towards
its peak.
Slide 29
TURN IN PACKET 8!! You wont be needing it for a few days
Slide 30
Bell Work: Monday 12/12/11 Get Packet 9 off front table. Read
pages 10, 11, and 12 SILENTLY. Per. 1, 2, 3: Make sure you turned
in Bell Work from last week Per. 1, 2, 3, 5, 6: Make sure Packet 8
is turned in.
Slide 31
Brake It, But Dont Break It- Packet 9, Page 10 Purpose: To use
Newtons laws of Motion to design a ramp that can transport fragile
materials safely Background: Background: You and your partners are
industrial engineers working at a glass company. At the warehouse,
cartons of fragile glassware are stored in a loft above the ground
floor. The president of the company has given you the job of
designing a ramp for carts to carry boxes of glassware down to the
main floor. The ramp must fit in a relatively small area and get
the glass down quickly, but without breaking. It will take too long
to wrap each glass with protective padding or to fasten the boxes
down. Speed alone must provide the margin of safety.
Slide 32
Data TablesShifting Units ONLY CHANGE ONE VARIABLE IN EACH
EXPERIMENT Task 1: Ramp Height Task 2: Starting Position Count how
far the washer shifted when it has finally stopped. Moving forward
= positive Moving backwards = negative No motion = O; Flies off =
OFF Brake It, But Dont Break It- Pg 10 Team Roles Work with tables
for final project. Look at the letter or number on the bottom of
your car so you use the same one tomorrow! Roles: changing height
(books), measuring ramp starting position, measuring distance
rolled, retrieving car, measuring shifting units, recording data.
Each group should stay in their own space during the entire class
period.
Slide 33
Bellwork: Tuesday 12/13/11 Where do we find each type of
friction in Brake it, But dont Break it? Sliding Friction Between
the washers and the cart (if there are shifting units) Rolling
Friction Between the wheels and the ramp as the cart rolls Fluid
Friction Between the air and the cart as it rolls
Slide 34
Rules For Final Challenge You will have 25 min to construct
your best ramp. You will use 10 washers on your car. The car must
slide down the ramp wheels side down The washer(s) will be stacked
in the center of the car, and cannot be attached to the car or to
each other. No stopping materials may be attached to the car, but
may be attached to the ramp.
Slide 35
Thursday: Brake It, But Dont Break It- Final Challenge Finish
Task 1 & 2 Ways to earn points, and earn the contract for ramp
building with the glass company! Highest ramp height Highest
starting position Stop in shortest distance Washers dont fall off
Ramp is successful on 1 st try You must call me over today to grade
your final challenge!
Slide 36
Pkt 8, Pg 15- Momentum ( p ) = mass * velocity Units = mass
(kg) * velocity (m/s) = kg*m/s All objects in motion have momentum
The more momentum an object has, the harder it is to stop Like
velocity and acceleration, described by a direction also Can a
small mass produce a large momentum? Of course! If so, can you
think of an example? A bullet shot from a gun What makes it have
such a large momentum? It has a small mass, but it has a very large
velocity
Slide 37
Law of Conservation of Momentum The total momentum of objects
in an interaction does not change, unless outside forces act on the
object The quantity of the momentum is the same before and after
objects interact
Slide 38
Uniform motion around a circle Is motion around a circle
accelerated motion? Why or why not? YES. By Newton's First Law, any
motion not in a straight line is accelerated, and requires a force
to maintain. Acceleration is a change in speed or direction
Slide 39
The force of gravity is at all times directed downwards and the
normal force is at all times directed perpendicular to the seat of
the car.
Slide 40
Centripetal Force- center seeking; push or pull on a moving
object directed towards the center of its curved path. Centrifugal
Force- center fleeing; push or pull on moving object directed
outwards from the center of the curved path. Newtons 3 rd Law-
Centripetal and Centrifugal forces are an action-reaction pair.
They are equal in magnitude, but opposite in direction. Centripetal
Force Back To Forces and Motion Centripetal Force = The push or
pull on a moving object toward the center of its curved path.
Centripetal force is always a net force.net force Back To Forces
and Motion Centrifugal Force DRAW THIS DIAGRAM Draw and label
arrows
Slide 41
Give It a Whirl- Pkt 9, pg 13 Exploring Circular Motion &
Whirling Rides You work for an amusement park ride design company.
The company has asked you to design a new whirling ride that
demonstrates centripetal force and G force, and wants you to submit
your ride concept in the form of a diagram. You will experiment
with a ride that has a seat attached to the end of a cable. The
cable and seat should be able to extend outward as the ride
revolves faster and faster. Incorporate this experiment into your
new and different thrill ride.
Slide 42
Measuring Motion in a Circle Radius, Diameter, Circumference
Radius: distance from center to the circles edge RPMs ( R
evolutions P er M inute): the number of times an object moves in a
complete circle (along the circumference) around a stationary
center, in one minute Note: Your trials are only 30 seconds each
Find average. Multiple average by 2. This is your Average RPMs
Slide 43
Procedures: Give it a Whirl Variables Roles Tips: 1. Practice
your twirling techniques 1. Hold ring not string!! 2. Finish the
trials for as many trials as possible (test how changing radius
affects the RPMs) Trial an instance of testing as part of a series
of tests or experiments **Demo of trial** Twirler Counter Timer
Recorder 1. Radius 2. Number of Gs Twirler- NO! the same person
must twirl for every trial, both days Variables
Slide 44
Bellwork- Tuesday 2/1/2011 1. Sketch the diagrams then label
the arrows to show the forces. Rotating Drum Ride (top view)Turning
a Corner Rollercoaster Loop Centripetal Force Centripetal Force
Centrifugal Force Centrifugal Force Centrifugal Force Inertia 2.
Define centripetal force, centrifugal force, and inertia.
Centripetal force- center seeking force in circular motion
Centrifugal force- center fleeing force in circular motion Inertia-
tendency of an object to resist a change in its motion Centripetal
Force
Slide 45
You attach a string to a ball and swing it in a circular
motion. What force is required to keep the ball moving in a
circular path? Centripetal force- required to keep the ball moving
in the circular path; directed towards center
Slide 46
Give It a Whirl (Day 2): Divide groups into 4 roles, again. All
students with roles OTHER THAN twirler, may change roles today. 1.
Twirler 2. Counter 3. Timer 4. Recorder To keep the experiment
valid, only one variable may changechanging the twirler (since all
people twirl differently) would be changing too much! Task for
today: Finish all trials (radius and Gs) Angle Sketching Task for
today: Finish all trials (radius and Gs) Angle Sketching
Slide 47
Bellwork: Wednesday 2/2/2011 Sketch a top view of the Give it a
Whirl apparatus Label the forces that occur: Inertia, centripetal
force, centrifugal force, gravitational force, net force.
Gravitational force Centripetal force Inertia Net Force Centrifugal
force
Slide 48
When Finished with GIAW Lab Finish graphs Conclusion questions
Create new spinning ride! detailed, colored, labeled with
forces
Slide 49
Bellwork: Thursday 1/13/2011 2. What is the net force on the
skydiver in B, C, and D? (include magnitude and direction). B = 833
N 350 N = 483 N down C = 833 N 700 N = 133 N down D = 833 N 833 N =
0 N (balanced) 3. What do we call the velocity of the skydiver in
Diagram D? Explain. Terminal velocity ; Air resistance = gravity 4.
If the plane was up 1,243 m when the 93 kg skydiver jumped, what
was his max PE? PE = mgh = 93 * 9.8 * 1243 = 1,132,870.2 J 5. He
reached a maximum velocity of 55.56 m/s (124 mph). What was his max
KE? KE = mv 2 = (93) * (55.56) 2 = 143,541.4 J 6. ACC: How much
energy did he lose to air friction? 1,132,870.2 J - 143,541.4 J =
989,328.8 J 1. What kind of friction is the skydiver experiencing?
Fluid Friction
Slide 50
Swing of Things: Pendulum Ride- pg 6
Slide 51
Swing of Things Period- the time for a cycle to pass the
observer Amplitude- the maximum angle reached by the pendulum;
amount displaced from resting position Think back to the Waves
Unit!!
Slide 52
LENGTH AMPLITUDE Measure with centimeters, not inches Dont cut
the string Roll/unroll around the pencil to make it shorter/longer
70cm & 80cm: Use chair/binder/textbooks to lift pendulum so it
does not drag on the ground Use the protractor Remember, measure
from the resting position, outwards HOLD THE WASHER, NOT THE STRING
WHEN MEASURING AMPLITUDE Each trial is timed, so there is no way to
RUSH through them. You must finish all 23 trials TODAY. Use your
cell phone stopwatch if you want.
Slide 53
If each colored line represents a different amplitude of the
pendulum, what is the amplitude (angle from rest- black) of each
color. ORANGE BLUE GREEN PINK??? 13-14 37-38 43-44 63-64
Slide 54
10 mins- Finish Swing of Things: Pendulum Ride- pg 6
Slide 55
How much potential energy does the 45 kg skateboarder to the
left have if he is 2 meters above the edge of a 18 meter tall half
pipe? PE = mgh PE = 45*9.8*20 PE = 8820 J What is his velocity at
the peak of his turn (shown left)? 0 m/s What is the KE at the
peak? KE = mv 2 KE = * (45) * 0 2 KE = 0 J Bellwork: Friday
1/14/2011
Slide 56
What type of energy does a bike rider have when they are
standing at the top of the half pipe? Gravitational Potential
Energy- stored energy due to height as they roll down the ramp?
Kinetic Energy- energy of motion
Slide 57
Semester One Final Exam Study Guide Due Thursday: Pages 1 &
2 Due Friday: Pages 3 & 4 Due Monday: Pages 5 & 6
Slide 58
Semester Exam Study Guide Use a highlighter to mark the number
of all the questions your partner did not finish Work on study
guide for the rest of the period! Finish blank questions Quiz each
other Go over correct answers to check each other Make sure OOPS
Passes are turned in!
Slide 59
Monday 1/24/2011 Day to work with group on Thrill Ride! Project
DUE: February 10, 2011 Model Brochure Presentation Participation
End of the Day Reflection
Slide 60
Bellwork: Tuesday 1/25/2011 1. Draw the ramps. Label where a
cart would have max PE and max KE. 2. Starting the same cart from
the top of each ramp, which ramp (pink, green, teal) would provide
the cart with the most PE? Why? Each ramp would provide the same
amount of PE. PE= mgh and the height of each ramp is the same. 3.
What would happen to the washers if the cart ran into a barrier?
They would fly forward and off of the cart. What law of motion
predicts this will happen? Explain. Newtons First Law the Law of
Inertia: The washers are moving forward on the cart and will
continue moving with the same velocity (speed and direction) even
if the cart hits a barrier. MAX PE MAX KE
Slide 61
10 mins- Finish Swing of Things: Pendulum Ride- pg 6
Slide 62
Bellwork- Wednesday 1/26/2011 1. State the formula for Newtons
2 nd Law of Motion. Force = mass * acceleration 2. A carts mass is
0.85 kg. What force would you have to apply to the cart if you want
to accelerate it 2 m/s 2 ? Force = mass * acceleration; F = 0.85 *
2 = 1.7 N 3. If you apply a force of 5 N to the same cart (0.85
kg), what will be the resulting acceleration? Acceleration =
force/mass; A= 5/0.85 = 5.88 m/s 2 4. You add washers to the cart
to increase its mass. You apply a force of 5 N to the cart, and it
accelerates 2.7 m/s 2, what was the mass of the cart? Mass =
force/acceleration; M = 5/2.7 = 1.85 kg How much mass did you add?
1.85 0.85 = 1 kg of washers
Slide 63
Friday 1/28/2011: Brake It, But Dont Break It- Final Challenge
Ways to earn points, and earn the contract for ramp building with
the glass company! Highest ramp height Highest starting position
Stop in shortest distance Washers dont fall off Ramp is successful
on 1 st try You must call me over today to grade your final
challenge! Work on final project when done
Slide 64
Thrill Ride! Final Project Packet What are your
responsibilities over the next weeks? Split up sections of the
rubric? Construct part of the ride? Working on this project the
entire week Keep in mind the themes for the different parts of Sir
Isaacs Inertialand! Your plans will be reviewed by Ms. Saunders. 1.
Fairness Survey- turn in daily Group Representative- new daily 2.
End of the Day Evaluation- turn in daily Everyone must individually
fill out their portion
Slide 65
1). Label the positions where a child would have Potential
energy (PE) and Kinetic energy (KE) 2). Describe the energy
transformations 3). Show arrows for any other forces contributing
to the motion of the playground equipment (gravity, friction)
Bellwork- Monday 1/31/2011 PLAYGROUND PHYSICS Sketch two types of
playground equipment (slide, swing, see saw, climbing equipment,
etc.) Slide- PE at top converts to KE when sliding to bottom Other:
gravity and friction Swing- Approaching the high point of the swing
= more and more KE gets stored as PE. Top- all PE, swinger stops
moving Other: gravity, pumping your legs adds energy See-saw- High
point has max PE grav ; Falling to ground PE converts to KE Other:
gravity, friction (air resistance)
Slide 66
Bellwork: Thursday 2/3/2011 RideAccidents.com Read the
passages. These are real accidents, and real examples of how what
we have been learning about can be dangerous and deadly. How do
Newtons Three Laws of Motion, forces, or other principles of
physics explain the cause of each accident? 1. Identify 2 scenarios
describe how each relates to class. i.e. Woman-Ferris wheel:
Without gravity and inertia (1 st law of motion), this could not
have happened. 2. Brainstorm 4 ways you can make the ride YOU
design much safer, using these situations and what you now
know.
Slide 67
Pink Bellwork Quiz- ONLINE @ Home Due FRIDAY or MONDAY Copy
Diagrams from small sheet to use on QUIZ
Slide 68
Thrill Ride! Final Project Packet Review expectations and
guidelines for project Yellow sheet- Work in groups to brainstorm,
fill out, and make plans. What are your responsibilities over the
next week? Split up sections of the rubric? Construct part of the
ride? Working on this project the entire upcoming week Keep in mind
the themes for the different parts of Sir Isaacs Inertialand! Your
plans will be reviewed by Ms. Saunders. 1. Group IDs 2. End of the
Day Evaluation- turn in daily Everyone must individually fill out
their portion
Slide 69
Bellwork: Friday 2/4/2011- G Forces 1. Why do I feel heavy at
the bottom of hills? 2. Why am I raised off the seat sometimes? 3.
What throws me to the side of the car on some parts of the ride? 4.
What throws me backwards on some rides? 1. Heavy? Positive Gs Max
on coaster= 5Gs (on a jet ~9Gs- special G suit) 2. Lifted off seat?
Negative Gs Below 1 G is negative. Weightless? Zero Gs 3. Thrown to
side? Lateral Gs when turning a corner NOTE: One G is the pull of
normal gravity. Currently, we are all at one G. 4. Thrown
backwards? Linear Gs
Slide 70
Thrill Ride! Final Project Packet Review expectations and
guidelines for project Yellow sheet- Work in groups to brainstorm,
fill out, and make plans. What are your responsibilities over the
next week? Split up sections of the rubric? Construct part of the
ride? Working on this project the entire upcoming week Keep in mind
the themes for the different parts of Sir Isaacs Inertialand! Your
plans will be reviewed by Ms. Saunders. 1. Group IDs 2. End of the
Day Evaluation- turn in daily Everyone must individually fill out
their portion
Slide 71
Bellwork: Monday 2/7/2011 Find the momentum for each situation.
Which has more momentum? Momentum = mass * velocity A 3 kg
sledgehammer swung at 1.5 m/s 3 kg * 1.5 m/s = 4.5 kg*m/s A 4 kg
sledgehammer swung at 0.9 m/s 4 kg * 0.9 m/s = 3.6 kg*m/s Show your
work to calculate both scenarios!
Slide 72
Thrill Ride! Final Project Packet Watch video of past
presentation Hand out presentation assignment guides Fill in
presentation guide Your plans will be reviewed by Ms. Saunders. End
of the Day Evaluation- turn in daily Everyone must individually
fill out their portion
Slide 73
Review Conclusion Questions- pg 19 Newtons Three Laws of
Motion: Review Newtons First Law: Law of Inertia- Objects in motion
tend to stay in motion and objects at rest tend to stay at rest
unless acted upon by an outside, unbalanced force. Newtons Second
Law: Force equals mass times acceleration (F = ma). Newtons Third
Law: Pairs of Forces- For every action there is an equal and
opposite reaction.
Slide 74
Bellwork: The more massive the object, the stronger the
gravitational pull on other objects True The farther the objects
are from each other, the stronger the gravitational pull False. The
closer the objects are together, the stronger the gravitational
pull.
Slide 75
Bellwork- Tuesday 12/15/2011 Sketch the diagram below. 1. The
PE at the top is 50 J, what is the potential energy at positions A,
B, C, D, E, F shown on the stair steps and the incline? 2. Can you
tell how much KE is at the bottom? Why or why not? (Hint: Law of
Conservation of Energy- Is the ball losing energy to anything on
the way down?) 3. What type of friction is the ball undergoing as
it is falling? As it is going down the slide? 1. A: 40 J B: 30 JC:
20 J D: 10 J E: 0 JF: 0 J 2. KE is less than 50 J at the bottom-
some is lost to friction (Kinetic energy thermal energy) Energy is
not created or destroyed only transformed to other types 3.
Falling- Fluid friction Slide- Rolling friction
Slide 76
Review Interim Essay Question A child rolls a marble down the
ramp as shown below. The marble travels across surface B at a
constant speed, then starts to go up the incline of surface C. A.
After the marble is released, state whether the forces are balanced
or unbalanced while on surface A. Unbalanced B. Using appropriate
vocabulary, describe the motion of the marble while it is traveling
down surface A. Accelerating, speeding up, increasing velocity C.
State the motion of the marble as it is traveling across surface B,
and support your statement with evidence. The forces are balanced
because its traveling at a constant speed. D. State the motion of
the marble as it is traveling up surface C, and support your
statement with evidence. The forces are unbalanced, so it is
decelerating, slowing down, decreasing velocity
Slide 77
Gravity- Mass and Distance Practice Problems If each of the
objects is identical, in which case is the gravitational force the
LEAST? 4.0 cm 3.5 cm 3.0 cm 2.5 cm As a satellite falls toward
Earth, the gravitational force between the satellite and the Earth
increases. Which statement best explains why there is an increase?
As the satellite approaches Earth, the satellite rotates faster The
mass of the satellite increases as it nears earth The distance
between Earth and the satellite decreases
Slide 78
Gravity- Mass and Distance Practice Problems The amount of
gravitational attraction between the Moon and an astronaut standing
on its surface depends on the astronauts distance from the center
of the Moon and the astronauts Height Mass Shape Weight Which of
these would result in the LEAST gravitational attraction? Two 2 g
objects, 2 meters apart Two 2 g objects, 4 meters apart Two 1 g
objects, 6 meters apart Two 1 g objects, 8 meters apart
Slide 79
Two guys are pulling on a rope. One pulls to the right with a
force of 700 N. The other pulls to the left with a force of 500 N.
What is the net force (magnitude and direction)? 200 N, right A
girl is playing pool, and is about to use the cue (white) ball to
hit the 8 ball into the corner pocket. Which diagram shows the
force she should apply to accelerate the cue ball? 500 N 700 N
Slide 80
Potential and Kinetic Energy Homework- pkt 8, pg 13 Energy
Basics 1. Potential 2. Kinetic 3. Kinetic 4. Potential 5. Potential
6. Kinetic 7. Kinetic 8. Kinetic (and/or Potential) 9. Potential
(and/or Kinetic) 10. Potential 11. Potential 12. Potential 13.
Kinetic (and/or Potential) What is energy? 1. Potential 2. Kinetic
3. Kinetic 4. Potential 5. Potential 6. Kinetic 7. Potential 8.
Highest KE- C (bottom); Lowest KE- A (top) 9. Highest PE- A (top);
Lowest PE- C (bottom) 10. 50 * 9.8 * 3 = 1470 J 11. Friction with
the slide/air; child pushing off, etc. 12. Rollercoaster, jumping
on a trampoline, etc. 27 pts
Slide 81
Bellwork: Wednesday 1/6/2011 1. Where is the maximum PE? A, B,
C? 2. What type of PE does the boy have? 3. Where is the maximum
KE? A, B, C? 4. What is the maximum PE of the boy? (Hint: You need
to use a formula to answer this!!) 5. What is the maximum KE of the
boy, if his velocity is 2 m/s? (Hint: You need to use a formula to
answer this!!) 1. A 2. Gravitational Potential Energy 3. B 4. PE
grav = mgh PE grav = 1960 Joules 5. KE = mv 2 KE = 40 Joules
Acceleration due to gravity = 9.8 m/s 2 Mass of the boy = 20
kg
Slide 82
Monday 1/11/10 OOPS passes/mini earths- collecting today
Otherwise bring on your exam day Exam Review Packet- Pages 5 &
6 Bring on your exam day I will give credit for it on this day
Jeopardy Review to Study Extra Credit opportunity
Slide 83
Bellwork- 1.Which path will the ball follow? (Letter; and Draw
it) 2.Which Law of Motion explains this? 3.Draw arrows and label
the following forces on the diagram you choose: gravity, inertia,
net force 1.Which path will the ball follow? (Letter; and Draw it)
2.Which Law of Motion explains this? 3.Draw arrows and label the
following forces on the diagram you choose: gravity, inertia, net
force Draw this diagram. When the ball at the end of the string
swings to its lowest point, the string is cut by a sharp
razor.
Slide 84
Bellwork- Friday 12/18/2011 a. The elephant will stop first due
to its larger mass. b. The ant will stop first due to its smaller
mass. c. The elephant and ant will stop at the same time. d. The
elephant and ant will not stop and will continue at 1 meter per
second as long as the ice lasts. Newtons First Law of Motion-
Inertia!! Suppose an elephant and an ant are both running at 1
meter per second when they both encounter a long patch of slick,
frictionless ice. They begin to slide on the ice. Which of the
following statements is true concerning their motion? Which law of
motion supports this answer?
Slide 85
Identifying the relationship between Kinetic and Potential
Energy How do the meters show the relationship between the amount
of Kinetic Energy (KE) the car has, and the amount of Potential
Energy (PE) the car has? As the amount of PE decreases, the amount
of KE increases, and vice versa.
Slide 86
Thrill Ride!! Indestructible Energy (Pkt 8, pg. 11) Paragraph 2
Define the Law of the Conservation of Energy. Energy cannot be
created or destroyed, only transformed from one form to another
Relate the amount of energy at the end of an event to the amount at
the beginning of the event. Equal to each other Paragraph 3 If you
were building a roller coaster, which hill would you make the
largest? Why? The first hill. The potential energy of the first
hill defines how much energy the rest of the ride has to work with.
What would happen if you made the second hill taller than the first
hill? The ride would not make it to the top of the second hill.
Paragraph 4 What are the two new forms of energy we see here? Heat
(thermal) energy and mechanical energy (ME = PE + KE) What causes
the warming of the track? Friction So, did we destroy the energy?
What happened? No, energy is never destroyed, an energy
transformation takes place.
Slide 87
Thrill Ride!! Indestructible Energy (pg. 17) Paragraph 5 What
is a vehicle that has a lot of friction with the air? Hummer,
semi-truck, UPS delivery truck What is a vehicle that does not have
a lot of friction with the air? (probably your dream car!) Think in
terms of air resistance. Corvette, Lamborghini Paragraph 6-
Important! In three words, what is kinetic energy? energy of motion
In two words, what is potential energy? stored energy
Slide 88
Thrill Ride!! Indestructible Energy (pg. 17) Paragraph 7 (3x)
Give an example of potential energy. How do we know it has
potential energy (or, what does it have the potential to do)?
Stretched rubber band- Potential to snap Water at the top of a
water fall- Potential to fall Gas in a car- Potential to make the
car move (3x) When does the energy change to kinetic energy? When
the rubber band is moving/snapping When the water is falling When
the car is driving/moving Paragraph 8 What is the relationship
between kinetic and potential energy throughout a ride? P.E. and
K.E. are transformed/converted from one form into the next as a car
moves up and down the hills Paragraph 9 Why does the reading say if
you apply the brakes long enough the ride will come to a stop?
Because the length of time the friction is applied, also influences
the force Paragraph 10 Why do we need mechanical energy? To pull
the car up the incline, this is the initial energy needed.
Slide 89
Due to the cars greater mass, it has more MOMENTUM. The more
momentum an object has, the harder it is to stop. Bellwork: Tuesday
11/25/08 You can catch a baseball moving at 20 m/s, but you cant
stop a car moving at the same speed. Why? Put your PINK Humpty
Dumpty Lab on your table to be collected.
Slide 90
Review of Concepts- Notes What did you learn that you can apply
to designing/building an amusement park ride? Give it a Whirl-
Roller Derby- Brake It, But Dont Break It-
Slide 91
Test Corrections # of question wrong A. Question B. Wrong
answer- why you chose it C. Correct answer- how you know this is
correct # 25 A.Which wave is high pitched, low pitched? loud, or
quiet? B.I said A was high pitched and loud, and B was low pitched
and quiet. I thought that a smaller wave would be quieter and
lower. C.A is low pitched and loud. B is high pitched and quiet. A
large wavelength/low frequency means low pitched. A large amplitude
means louder.
Slide 92
Bellwork Tuesday 12/2/08 1. If a fire engine and a tricycle are
rolling at a speed of 5 km/hr, which would be easier to stop? Why?
2. Can a bullet and an automobile have the same momentum? Explain
how. 3. When a truck driver begins to brake, what happens to the
momentum of the truck? Explain.
Slide 93
Bellwork: Thursday 12.11.2008 Lazy Coin Refer to the beaker,
index card, and coin in the back of the room. 1. How can you move
the coin into the cup without touching the coin, or holding the
card? 2. What principle of physics or Law of Motion explains why
this is possible? 1. When you flick the card, the lazy coin falls
into the cup. 2. This is due Newtons First Law of Motion- The Law
of Inertia. The coin remains where it is (at rest) even though the
card is gone.
Slide 94
Draw free body diagrams to illustrate the forces on the coin
and cup at different parts of the journey. 1. Flicking the card to
the left; card sliding (4) 2. Coin falling, accelerating downwards
(2) 3. Coin hitting the ground (2) STUMPED? Forces to consider: F
app - flicking the cup F grav - pulling the coin into the cup F
frict - sliding friction between coin and card F air - air
resistance between falling coin and bottom of the cup F norm - card
pushing up or cup bottom pushing up
Slide 95
Bellwork: Friday 12/12/2008 Riding over a wet road, the wheels
of a bike acquire a coating of water which soon flies off again. 1.
In which direction does it fly off? 2. What principle of physics
explains why this happens? 3. Draw a diagram of the wheel and
water, showing what you would see. 1. It will fly backwards and
upwards from the rim of the wheel. This is why truckers hang
mudguards behind their wheels. 2. 1 st Law of Motion Inertia
3.
Slide 96
Tasks for Today Guided Notes: Brochure ALL members of the group
should have one Group Goal Setting End of the Day Reflection- turn
in daily Fairness Survey- turn in daily Group Representative- new
daily Take a moment to grade your teammates. How well did you work
together? Answer all questions completely and honestly. LAST DAY in
the computer lab! Make effective use of your time! After break- In
class work on Monday, Tuesday, and Wednesday FINAL brochure, FINAL
ride, FINAL presentation must all be ready by Thursday after
break!!!!!
Slide 97
The LAST DAY for any make up workincluding any past labs,
quizzes, etc... Tuesday, January 6 th NO EXCEPTIONS!!!!!!
Slide 98
Bellwork: Friday 12/19/2008 What Law of Motion am I talking
about? 1. The book on the car dashboard slides off and falls into
your lap when the light turns green, and the car starts to move? 1
st Law of Motion If the object was sitting still, it will remain
stationary. 2. Why you have to wear a seatbelt? (besides for, Its
the law!) 1 st Law of Motion If it was moving at a constant
velocity, it will keep moving. Basically, an object will keep doing
what it was doing unless acted on by an unbalanced force.
Slide 99
Monday 1/5/2011 Final Project Work in groups on brainstorming,
filling out yellow sheet, and making goals/plans for this week.
Guided Notes: Brochure ALL members of the group should have one
Group Goal Setting End of the Day Reflection- turn in daily
Fairness Survey- turn in daily What are your responsibilities over
the next 3 days? Split up sections of the rubric? Construct part of
the ride? Type part of the brochure? Monday- In class work Tuesday-
In class work; LAST DAY for any make up workpast labs, quizzes,
etc... Wednesday- In class work Thursday- FINAL brochure, FINAL
ride, FINAL presentation DUE Friday- 6 th and 7 th grade
presentations
Slide 100
Tuesday 1/6/2011 Final Project Group Goal Setting End of the
Day Reflection- turn in daily Fairness Survey- turn in daily What
are your responsibilities over the next 2 days? Split up sections
of the rubric? Construct part of the ride? Type part of the
brochure? Notes: A marble can serve as the rider on your ride Look
at pictures of rides from last year Tuesday- In class work; LAST
DAY for any make up workpast labs, quizzes, etc... Wednesday- In
class work Thursday- FORMAL FINAL brochure, FINAL ride, FINAL
presentation DUE Friday- INFORMAL 6 th and 7 th grade
presentations
Slide 101
Wednesday 1/7/2011 Final Project Group Goal Setting End of the
Day Reflection- turn in daily Fairness Survey- turn in daily What
are your responsibilities over the next day? INTENTIONAL DRESS
TOMORROW Formal or Theme NEW FOR TODAY: Review Guide for Final Exam
Exams next W, Th, F Final Essay Question See end of the class on
Monday Write beginning of class on Tuesday Wednesday- In class work
Thursday- FORMAL FINAL brochure, FINAL ride, FINAL presentation DUE
Friday- INFORMAL 6 th and 7 th grade presentations
Slide 102
Thursday 1/8/2011 Oral Presentation role assignments--Exact
specifications for presentation TODAY 3-5 mins long- NO LONGER
Conclusion Do not read directly from brochure Prepare for your
presentation by giving your speech one time through with your
group, making sure that every individual knows what they will be
saying, and practicing good eye contact, clear and loud voices, and
positive body language.
Slide 103
Review proper presentation etiquette Be a good listener by not
talking while other groups are presenting Give each group your
undivided attention Clap when each group is finished Write down two
things you think each group did well and one thing that they could
improve upon for Fridays Fair
Slide 104
Bellwork: Monday 1/12/09 A snowball stays on the porch railing
all day long until someone picks it up and throws it. That same
snowball will stay in motion until it is acted upon by a target of
some sort, like a tree. >. At that time, it will stop
immediately because the tree exerted a force on it. Describe the
day in the life of the snowball in terms of forces, motion, and
Laws of Motion. Be specific in defining the parts of the snowballs
journey: 1. On railing 2. Moving through air 3. Hitting Tree
Slide 105
Classroom Business PROJECT: Please take home your Amusement
Park Ride by Tuesday Tuesday after school rides will be
disassembled and thrown away Grades for Participation, Model, and
Presentation will be on Parentlink tonight EXAM: We will play
Jeopardy Review Monday and Tuesday If you need to take your Science
binder home to work on your study guide, feel free to do so I will
stay afterschool on Monday and Tuesday if you need help on any of
the study guide questions. FINAL GRADES: I am collecting OOPs
Passes and Mini-Earths tomorrow for extra credit to be added to
this quarter. OOPs Passes will automatically be added If you submit
Mini-Earths they will all automatically be added to the 2 nd
quarter grade unless you note otherwise
Slide 106
Bellwork 1/13/09 Sketch and Label What types of waves are
these? Transverse Longitudinal Label the different parts (A, B, C)
with the following: Wavelength Amplitude Compression Rarefaction
Crest Trough Normal/Rest Positon Crest Trough Normal/Rest Position
Rarefaction Compression Wavelength Amplitude Transverse
Longitudinal
Slide 107
Classroom Business PROJECT: Please take home your Amusement
Park Ride by TODAY Tuesday after school rides will be disassembled
and thrown away Grades for Participation, Model, and Presentation
are on Parentlink EXAM: Final Exam Essay Today We will play
Jeopardy Review today, Tuesday If you need to take your Science
binder home to work on your study guide, feel free to do so I will
stay afterschool today, Tuesday if you need help on any of the
study guide questions. FINAL GRADES: I am collecting OOPs Passes
and Mini-Earths TODAY for extra credit to be added to this quarter.
OOPs Passes will automatically be added If you submit Mini-Earths
they will all automatically be added to the 2 nd quarter grade
unless you note otherwise
Slide 108
Project Reflection 1. How did you like the process of choosing
groups? How could it have been made better? 2. Did you like the
timing of the projectspanning Winter Break? Or would you have
rather had it due before break? 3. How could your time have been
more well-structured IN CLASS? 4. Any other comments about the
Thrill Ride project?
Slide 109
Bellwork- 1/7/2008 Metric Ladder/Metric Conversions On
board
Slide 110
Bellwork 1-8-2008 56.9 m = _______ cm Draw 3 boxes, then sketch
the molecular arrangement of a solid, liquid, and gas :
solidliquidgas
Slide 111
Review Procedures Group Goal Setting End of the Day Reflection-
turn in Fairness Survey- turn in In class work today!! LAST DAY!!
Oral Presentation role assignments--Exact specifications for
presentation TODAY 3-5 mins long- NO LONGER Conclusion Do not read
directly from brochure FINAL brochure, FINAL ride, FINAL
presentation must all be ready by TOMORROW!!!!! Wear your
professional dress/clothes tomorrow!
Slide 112
Final Exam Preparation Work quietly with a partner to complete
the Final Exam study guide Tomorrow: Final Exam Essay Test Homework
tonight: Prepare for Essay Test tomorrow
Slide 113
We have a ball of tissue sitting in the mouth of a bottle. When
we blow the tissue, it flies out of the bottle instead of being
pushed in. Why? When we blow at the tissue, most of the air goes
around the tissue, hits the back of the bottle, and comes back out
again (after bouncing off the back of the bottle). This pushes the
tissue out of rather than into the bottle. We can make the tissue
ball go into the bottle, by blowing right at it using a straw.
Slide 114
Roller Coasters: Wooden vs. Steel Steel- faster, higher, loops
Fastest: Kingda Ka, 128 mph Wooden- psychological advantage-track
sways few inches- feet Fastest: Son of the Beast, 78 mph
Slide 115
With remaining time When finished, read Discovery File: Newtons
Laws, a Moving Experience (Thrill Ride!, page 23) before beginning
to answer the questions in the Lab. Then, begin your homework for
tonight: State Newtons Three Laws of Motion and give an example of
each. Use Chapter 10 of your textbook or the Internet as your
reference
Slide 116
Bellwork: 11/6/07 *Write on BLUE Worksheet!* I like physical
science laws because they treat everyone fairly: White, Black,
Asian, Hispanic, rich, poorall are treated without favoritism by
science laws. The only people who are hurt by them are people who
ignore them. If you believe in them, they work. If you don't
believe in them, they still work. Name one difference between
science laws and the laws of our country. If youve played
basketball in a gym, you have noticed that beneath the backboard,
behind the hoop, there is a padded wall. What principle of physics
explains why this padding is necessary?
Slide 117
Bellwork 11/8/07 You are a copy writer for a company that sells
skin care products. You have been asked to write a paragraph
describing a new sunless tanning product that contains SPF15.
However, in reviewing the product description from the lab that
creates your companys products, you find that the SPF has not
actually been added to the product yet. The lab technicians have
been unable to find a way to combine the SPF with ingredients in
the product that do not cause an allergic reaction in people with
sensitive skin. They plan to continue working on this and hope to
have a solution to the problem soon. But, your supervisor wants to
begin selling the product now, before the solution has actually
been found. Write a short paragraph describing the product for the
companys Web page.
Slide 118
What is the name of the ride that you have created for your
proposal to the president of the amusement park ride design company
you work for? You are in a boat that is sinking in the middle of a
lake. You attempt to save yourself and the boat by patching the
hole, and throwing the water out of the boat using a bucket. What
principal of physics explains why the way you move the bucket
enables the water to empty from it? Which Law of Motion is this?
(You would use the law of inertia to empty it. You set the bucket
and water in motion, and then quickly pull the bucket back. The
water, by the law of inertia, keeps going. This is the First Law of
Motion, also called the Law of Inertia.)
Slide 119
What Law of Motion am I talking about? 1. Basically, an object
will keep doing what it was doing unless acted on by an unbalanced
force. 1 st Law of Motion 2. If the object was sitting still, it
will remain stationary. If it was moving at a constant velocity, it
will keep moving. 1 st Law of Motion 3. It takes force to change
the motion of an object. 1 st Law of Motion
Slide 120
If a roller coaster car is displaced from ground level to the
top of the first drop of a roller coaster ride, then a chain driven
by a motor supplies the force to do the work on the car. When the
work is done upon the object, that object gains energy. The energy
acquired by the objects upon which work is done is known as
mechanical energy. an object with mechanical energy is able to do
work on another object.
Slide 121
Engineering at the Cutting Edge Roller Coasters - 4 of 8
Movement - Video Start 1m 53s
Slide 122
Put your Memo, Diagram, and Yellow Packet, pen/pencil on your
desk Overview Peer Review Please take this seriously You will turn
in YOUR OWN review with your memo and diagram on MONDAY! If you
dont have anything ready todayit is considered LATE- 20% off If you
are ready to turn yours in today, thats fine, but make sure you
looked over the suggestions from your peer
Slide 123
Roller Derby Guidelines for filling in data table Top of slide
must be 50cm off the ground One part of the slide must touch the
ground before the rider goes into the cup Record data for ALL
TRIALS! successful and unsuccessful Possible roles: Recorder (1-2
people) Measurer (1-2 people) - measure starting and ending height
Builder, Mover, Adjuster (1-2 people) reposition the slide to make
the rider/ball go in the cup
Slide 124
Roller Derby Refer to Roller Derby Activity Grading Rubric (on
your table) Starting Height (Hs): at least 50cm off the ground One
part of the slide must touch the ground before the rider goes into
the cup Finishing Height (Hf): at least 10cm off the ground No one
needs to hold the slide up for it to work Ball rolls successfully
into the cup on the first try!! Bonus: 360 degree loop, hill, 180
degree turn, 90 degree turn CALL MS. SAUNDERS WHEN YOU ARE READY TO
BE GRADED! Record data for ALL TRIALS! successful and unsuccessful
Possible roles: Recorder (1-2 people) Measurer (1-2 people) -
measure starting and ending height Builder, Mover, Adjuster (1-2
people) reposition the slide to make the rider/ball go in the
cup
Slide 125
Bellwork 12-10-07 2. Remember the elephant & the ant on the
frictionless ice, sliding forever? Now, 2 helpful Science 8
students decide to help them. The two students exert a force on the
elephant of 1 N and a force on the ant of 1 N. Which of the
following statements is true ? Why? (Hint: 2 nd Law of Motion) a.
The elephant will stop first due to its larger mass. b. The ant
will stop first due to its smaller mass. c. The elephant and ant
will stop at the same time. d. The elephant and ant will not stop
and will continue at 1 mile per hour as long as the ice lasts.