Day 1 - A "Patterns" Approach to Physicslennoxphysics.weebly.com/uploads/3/0/9/4/...forces_fp.pptx.pdf · Vectors WS Begin Defining Newton’s Laws New Unit ... Be able to identify

Freshman Physics 1 Force & Interaction

Day 1Agenda: ● Review of velocity,

acceleration & force● Vectors WS● Begin Defining Newton’s

Laws

New Unit➢ Interaction & Forces

Do Now:Go Formative-- “Intro To Forces”

Due Today Semester 1 ReflectionDue Next ClassVectors WS


Physics Review

Use your Physics Binder as a reference tool to define the terms below in your new Toolbox.

● Velocity

● Acceleration

● Force

● Interaction


Vectors Worksheet

● The world’s greatest super-villain

● A mathematical term represented by an arrow, with both a direction and magnitude… OH YEAH!

Vector:


Net Force and Equilibrium

● Net Force: The sum of all force vectors acting on an object

● Equilibrium: A system is in equilibrium if the forces are balanced. (FNet= 0 N)


Vectors Worksheet

Each square represents a force of ONE NEWTON.

Magnitude = 5 NDirection = Right

Example:

This vector shows a 5 N force to the right.

Finish Questions1 and 2

of Packet


Vector Addition● More than one force

can act on an object at the same time.

● The first vector has shows a force of 5 N to the right.

● The second vector has shows a force of 3 N to the right.

● The sum of these 2 vectors would be 8 N to the right.

FNET (Resultant)


Vector Addition● Forces acting in

opposite directions● The first vector has

shows a force of 5 N to the right.

● The second vector has shows a force of 3 N to the left. ● The sum of these 2

vectors would be 2 N to the right.

FNET (Resultant)


Finish Question3 of Packet

Do not continue on to question 4


Newton’s Laws

Newton’s 1st Law:

Newton’s 2nd Law:

Newton’s 3rd Law: (not yet!)


Forces


Forces

FNet = 0

Constant Velocity

FNet ≠ 0

Speeding up Slowing down

Balanced Unbalanced

Objects in motion stay in motion.Objects at rest stay at rest

When there is an unbalanced force, things accelerate

FNet in direction of motion

FNet in opposite direction

as motionAt Rest Constant Motion

v = 0 v ≠ 0

Constant change in motion (acceleration)


Forces

FNet = 0

Constant Velocity

FNet ≠ 0


Balanced Unbalanced

Objects in motion stay in motion.Objects at rest stay at rest

When there is an unbalanced force, things accelerate

FNet in direction of motion

FNet in opposite direction


v = 0 v ≠ 0

Constant change in motion (acceleration)


Now use your flowchart to finish the Vectors WS



Day 2 Agenda: Pushy-Joe Simulation & Data Collection

Do Now:● What happens when

forces are balanced on an object?

● What happens when forces are unbalanced on an object?

Due TodayVectors Worksheet Due Next Class Pushy Joe


Pushy Joe ActivityWhatever Angie comes up with :)


Pushy Joe Lab

Groups:A: GirlB: Bucket of WaterC: Girl holding the CrateD: Dude sitting on the Crate

Physics FP 18 Intro to Energy + Engineering a Wind Turbine

Pushy Joe Lab

Wild Guess: What is the acceleration of your object when FNet= 500 N?


Pushy Joe Lab

Research Question:How does the Net Force acting on an object affect its acceleration?


Pushy Joe Lab

Variables:1. Identify the independent variables.

2. Identify the dependent variables.

3. Identify the controlled variables.


Pushy Joe LabHypothesis:

1) Sketch in graph form 2) In words “I think Net Force depends on

Acceleration in a ______ relationship”

Net

For

ce

Acceleration


Pushy Joe Lab

Method:1. Procedure

2. How will you change the independent variables?

3. How will you control the controlled variables?


Pushy Joe LabData Collection


Pushy Joe Lab

● Use Desmos.com to graph your data and determine the equation of the best-fit line.○ Remember to use the Lincoln Start-up File

● Re-create your graph on the class-agreed scale


Pushy Joe Lab

● Write a 5-step Conclusion to the lab. ○ Remember to use your own equation and

your own mass for your data-informed prediction and confidence.

○ Use your Physics Binder as a resource/ reminder!



Measuring Forces Activity1. Complete the Prediction boxes for each

scenario.2. Show Mr. Hill complete boxes to get 2 spring

scales.3. Make measurements in Newtons (N).

Anchor Scenarios – need exemplar to stay up


If Time Allows: Mini-Lab

Prediction: How much 600 g will weigh?

Research Question: How is mass related to weight?


By the End of Class You Should…

Content Objective

Language Objective

Be able to identify balanced and unbalanced forces.

Be able to use words and arrows to describe forces.


Cover Homework

Rd 2.1 & 2.2 Q: 1,3,6,8,22,27


Making Sense of Measuring Forces Activity

1. If an object doesn’t move what must be true about all the forces on the object?

2. In situation #5 you pulled 1 N and found the max force of friction to around 1 N, then in situation #6 you pulled 0.5 N, what can we infer about how hard friction resisted the motion in this case?

3. Big Idea: friction only pulls back as hard as you pull, up until it maxes out. Then it just pulls its maximum


Throwing Book on Table vs. Skateboard

Interaction-

If table pulls book (slowing it down); book must push on table.

Is this true?


Graphs Help Us See Patterns

Object Strength of InteractionSticky Book with lots of duct tape Very StrongSticky Book with little duct tape StrongSticky Residue from tape Pretty StrongSmooth Book MediumOn Pens Little

So let’s graph how objects moved based on the strength of their interaction with another object


Let’s get active!Super Strong Friction (a lot of tape)

High Friction (a little tape)

Medium Friction (a little masking tape)

Low Friction(just book)

Tiny Friction(book on pens)

Distance object rolls Force Needed to Keep It Moving

No Friction(imagine)


Title these graphs, regarding their Big Ideas

Super Strong Friction

High Friction

Medium Friction

Low Friction

Tiny Friction

Distance object rolls Force Needed to Keep It Moving

No Friction

Friction slows things down

It is natural to keep moving, friction is what makes thing stop


Super Sticky Friction

High Sticky Friction

Medium Friction

Low Friction

Tiny Friction

Force Needed to Keep Moving

Distance roll

Things in motion seem to stay in motion!

It is the force of friction that slows things down.


We Call This Property of Things…

Inertia


Key Vocabulary

Inertia: The property of all things to continue their motion until acted upon by a total force.


Making Sense of Measuring Forces Activity

1. If an object doesn’t move what must be true about all the forces on the object?

2. In situation #5 you pulled 1 N and found the max force of friction to around 1 N, then in situation #6 you pulled 0.5 N, what can we infer about how hard friction resisted the motion in this case?

3. Big Idea: friction only pulls back as hard as you pull, up until it maxes out. Then it just pulls its maximum

4. How can you achieve situation #10?


Key Vocabulary

Net Force: The total force on an object.

Equilibrium: all forces are balanced. Total force or Net Force is zero.


SQPRRS 2.3 & 2.4

SurveyQuestionPredictReadRespondSummarize


Day 3 Physics - Mr. Hill

Agenda: Finding Patterns in Force through Data Mining

Upcoming Events➢

Skywork Question:Scientist often utilize data that someone else already collected to answer their own new question

For example: Describe or Read “Mining Google searches for drug side effects”

Due Next Class Packet Page 5Due Today Rd 2.3 & 2.4, Q: 24-27: 14,15,23,26,27

https://docs.google.com/a/beaverton.k12.or.us/file/d/0Byve9dE9V52nbkUyOFA2YXF2U00/edit






Cover Homework

Rd 2.3 & 2.4, Q: 24-27: 14,15,23,26,27



Content ObjectiveBe to evaluate a pre existing data set for its usefulness to

answer your question.

Language ObjectiveBe able to discuss a pattern with supporting evidence.


Experimenting on the Effect of Unbalanced Forces

Wild Guess: How far will the ball bearing roll from the ramp if the force of friction on the ball from the carpet is 0.031 N.

Research Question: Next slide, depends on what group you are in.

http://goo.gl/q8wqgP



Group A how does the Applied Force change the motion of a ball?

Group B how does the Friction Force change the motion of a ball?

Group 1 How does an unbalanced total force affect acceleration?

Group 2 How does the mass affect acceleration?

Group C how does the speed change the effect of the total force on the motion?


Ramping Up our HypothesisHypothesis:

1) sketch in graph form (think about one set-up from

previous slide than think doubling or halving the width)2) in words “I think the ______ affects the

acceleration in a ______ relationship, this makes sense because ________”

acceleration

Your Parameter(Fa, Ff, Ftotal, mass, speed)



Variables:1. identify the independent variables

2. identify the dependent variables

3. Identify the controlled variables


Find File at http://goo.gl/q8wqgP

Method:1. Open Data File and Orientate Yourself

• Scan headings• Total Force needs attention (equation, error, …)• What kind of carpet• What kind of balls are these



Value of controlled variables:

SurfaceMass of

Ball (kg)

Force of Push on

Ball (N) +/-

0.2

Force of Friction on

Ball (N) +/- 0.2

Total Force on

Ball (N)

Starting Speed of the Ball

(MPH) +/- 0.3

Speed of the Ball after 10 Seconds (MPH) +/- 0.3

Change in Speed of the Ball over 10

Seconds (MPH/(10 s))

+/- 1


Second(MPH/s) +/- 1

Carpet 0.4 2 0.05 1.95 1.0 1.0 0.0 0.0Carpet 0.5 2 0.05 1.95 0.0 1.0 1.0 0.1Carpet 0.6 2 0.05 1.95 3.0 6.0 3.0 0.3

Surface Mass of Ball (kg)

Force of Push on

Ball (N) +/-

0.2

Force of Friction on

Ball (N) +/- 0.2

Total Force on

Ball (N)

Starting Speed of the

Ball (MPH) +/-

0.3

Speed of the Ball after 10

Seconds (MPH) +/-

0.3

Change in Speed of the Ball over

10 Seconds (MPH/(10 s)) +/-

1


Second(MPH/s) +/- 1

Carpet 0.5 0 0 0 10 10 0 0Carpet 0.5 0.1 0.05 0.05 11 12 1 0.1Carpet 0.5 0.2 0.05 0.15 14 17 3 0.3Carpet 0.5 0.3 0.05 0.25 0 5 5 0.5Carpet 0.5 0.4 0.05 0.35 7 14 7 0.7


Graph of Good Data


Graph of Good Data


Graph of Good Data


Board MeetingMaking Sense of all this Data

1. Let’s orient ourselves to these graphs.2. Let’s start with acceleration vs mass.

1. What is the pattern?2. Why does this make sense?3. Where did the constant 4.9 come from?4. Why does this make sense?

3. What is going on in the acceleration vs total force graph?


Experimenting with Effect of Unbalanced Forces



+


Note on Scientific Language


Conclusion: Since the best-fit line of all our data is _____, I

conclude that there is a _______ relationship between the acceleration and ________. This can be represented mathematically:

So I predict through using computational reasoning that with a force of friction of ___ N, the ball will roll ___ m on the carpet. My confidence is _____ because _____________.

Next Slide


Computation Reasoning with Excel to get Prediction

Create a motion data table (t, x, v, a)Put in “a” from wild guess and pattern with force.Create dummy time intervalsSet and drag equations for v and xThen look for where ball stopsThen read x for that condition


Test Prediction

I get what Mr. Hill means when he says “we take some measurements about how much friction there is when you change the surface or how hard to press the surfaces together, apply some mathematics to find a pattern, and than we can predict the amount of friction there will be in a new case involving the same surfaces.


Prediction

Draw ramp, ball, and carpet and work from this drawing.


Test Prediction

Science works!We can find a pattern in nature and use it to

accurately predict the future.

Wild guess sometimes close, sometimes not. How do you know which of these it is? With careful investigation we can predict the future again and again – with some level of confidence.


Monday, January 7thPhysics - Mr. Hill

Agenda: Day 4Finish Experiment on Effect of ForcesReasoning about Force & InteractionsBalanced vs Unbalanced

Upcoming Next Friday➢

Skywork Question:1. What happens when forces are balance on an object?

2. What happens when forces on unbalanced on an object.

Due Next Class Packet Page 2 (except for Ff) & 6Due Today Packet Page 5



Content ObjectiveHave a working understanding of the role of Inquiry & into

Science.



Cover Pages 5


Finish Data Mining to Find Newton’s Second Law


Forces

Ftotal = 0

Constant Velocity

Ftotal ≠ 0


Balanced Unbalanced

Objects in motion tend to stay in motion.Objects at rest tend to stay at rest

When you really push,

things accelerate

Ftotal in direction of motion

Ftotal in opposite direction


v = 0 v ≠ 0

? Acceleration ?

How do we complete this chart?


Put in ToolboxPhysics

1 – Inquiry & Patterns

2 – Motion & Energy

4 – Energy & Interactions

SI – Scientific Inquiry Fold Here

3 – Interaction & Forces

EP – Engineering Projects


Forces

Fnet = 0

Constant Velocity

Fnet ≠ 0

Constant Acceleration


Balanced Unbalanced

Objects in motion tend to stay in motion.Objects at rest tend to stay at rest

When you really push,

things accelerate

Fnet in direction of motion

Fnet in opposite directionas motion

At Rest Constant Motion

v = 0 v ≠ 0


Key Vocabulary

Newton’s Second Law: Acceleration depends on both the total force and the mass of the object


Pattern: LinearAcceleration vs Net Force

When Force is doubled, acceleration is doubled

2

2

4

4

so when F F , a a

and when F F, a a


Pattern: InverseAcceleration vs Mass

When mass is doubled, acceleration will decrease by half4

42

2

so when m m, a a

and when m m, a a


Begin Packet 2, 6



Agenda:Reasoning about ForcesUsing Force Analysis to solve problemsSQPRRS

Upcoming Next Week ➢ Short Answer Quiz on Forces

Skywork Question:Can there be an interaction with a single object?

Due Today Packet Page 2 (except for Ff) & 6Due Next Class Rd 6.1-6.3 Q’s: 1,2,5,6,21,22,23,31,33



Content ObjectiveYou should be able to distinguish between forces within an

interaction and multiple forces on a single object.

Language ObjectiveBe able to use accurately use ‘force pairs’ and ‘total force’

to describe physical scenarios.


Key Vocabulary

Newton’s Third Law: Forces comes in pairs


Pencil pushes table

Table pushes pencil


Earth pulls weight

Weight pulls ______


Weight pulls string

String pulls ______


Air pushes blade

Blade pushes _______


Person pushes down on log

Log pushes up on_____


Cliff pushes up on_____

Log pushes down on cliff


A B

Person A pulls on metal

Metal pulls on _____

Person B pulls on metal

Metal pulls on _____


A BPerson A pushes metal

Metal pushes ______

Person B pushes metal

Metal pushes _____


Cover Page 2 & 6


Reasoning about Force & Interactions

Explaining through cartoons these three scenarios with a cyclist:1. Cyclist pedals kind of strong to go a constant 10

mph.2. Cyclist pedals super strong to speed up to 25 mph.3. Cyclist then has to pedal medium strong just to

stay going a constant 25 mph.

Visually: scene, Fpedal, Fair resistance, Fnet, Balance/Unbalanced

+ 1 sentence reasoning

Anchor Scenarios - need on poster paper to stay up


Analyzing Surprising Situations with ForcesErin says “Mr. Hill that stuff about interaction can’t be

right. When I drop a basketball it falls to the earth, the earth doesn’t also fall towards the basketball.”

Think. Pair. Share. Write.

Mass of Basketball 0.6 kgMass of Earth 6000000000000000000000000 kg

Force of interaction on each other W = mg = 6 NWhat impact will that have in changing each of their motions?

What sort of acceleration is involve for each? What about of time is the change happening for? What will be the net movement of each in this time?

Need on poster paper to stay up


SQPRRS 6.1-6.3On Whiteboards


Due Tomorrow Rd 6.1-6.3 Q’s: 1,2,5,6,21,22,23,31,33


Check In: You Should…

Content ObjectiveYou should be able to distinguish between forces within an

interaction and multiple forces on a single object.

Language ObjectiveBe able to use accurately use ‘force pairs’ and ‘total force’

to describe physical scenarios.



Agenda: Cover HomeworkUsing Force Analysis to solve problemsExperimenting with Friction

Upcoming Next Week ➢ Short Answer Quiz on ForcesDue Next Class Packet Page 7 Due Today Rd 6.1-6.3 Q’s: 1,2,5,6,21,22,23,31,33

Skywork Question:How could we make the frictional force between a book and the table bigger?



Content ObjectiveHave a working understanding of patterns with friction

Language ObjectiveBe able to discuss the patterns friction using supporting

evidence.


Cover HomeworkRd 6.1-6.3 Q’s:

1,2,5,6,21,22,23,31,33


In an experiment, you use a spring scale to pull a 0.5 kg wood block. You observe the block does not move at first, even when you pull with 2.0 N of force. Immediately after pulling the slightest bit harder the block begins to accelerate.


a a

Fapplied Fnet


Connecting to These Scenarios

Make your cartoons quantitative for the three scenarios with a cyclist:1. Cyclist pedals kind of strong to go a constant 10







Experimenting with the Force of Friction

Wild Guess: How hard will you have to pull 6 Physics Text Books to keep them moving if they are stacked on top of 10 round pens that are on the table?

Research Question: How do surfaces and amount of force the

surfaces are pressed together affect friction?



Group A: How does the strength of friction for a book on table top depend on how hard the book and tabletop are pressed together?

Group B: How does the strength friction for a book on pens depend on how hard the book and pens are pressed together?

Group C: How does the strength of friction to start a book on table top moving depend on how hard the book and tabletop are pressed together?


Experimenting with the Force of FrictionHypothesis:

1) Sketch in graph form (think about one set-up from

previous slide than think doubling or halving the width)2) In words “I think the force pressed together

affects the force of friction in a ______ relationship”

Force of FrictionFf

Force pressed together(weight)

2 lines: 1 for book on table 1 for book on pens 1 for book stuck on table



Variables:1. Identify the independent variables

2. Identify the dependent variables




Method:1. Experimental set-up




Experimenting with the Force of Friction Value of controlled variables: g = 10 m/s2 ; book = ___ N

Force PressedTogether

(N) +/- __

Force of Friction (N) +/- ___ Average Friction

(N)Uncertainty in Friction

(N)

Trial 1 Trial 2 Trial 3

0

17

34

51

if books stays at constant velocity



What is this?

25 50

10

25

Force Pressed Together (N)

Fric

tion

(N)

5

20

15


Graphs of Good Data



Agenda: Making Sense of the Patterns

with FrictionReading about Free Fall and Air Resistance

Upcoming Next Week ➢ Short Answer Quiz on Forces

Skywork Question:

Due Today Packet Page 7 & complete all of 2 Due Next Class Rd 6.6 & 6.7 Q’s: 13,15,17,19,38,47




Science.



Board Meeting



What is this?

25 50

10

25

Force Pressed Together (N)

Fric

tion

(N)

5

20

15 friction = ____ * force pressed together

friction = ____ * force pressed togetherstatic

rolling



stickiness factor



stickiness factor

stickiness factor


Experimenting with the Force of FrictionConclusion: Since the best-fit line of our data is linear for both

static and rolling situations, we conclude that there is a linear relationship between the force of friction and the force two objects are pressed together. This can be represented mathematically

So I predict with ______ confidence, it will take __ N to pull a pile of 6 books stack on 10 rounds pens on a table, because __________.

static friction = ____ * force pressed togetherrolling friction = ____ * force pressed together


Application QuestionExplain by referencing data, why we often put

things on wheels or ball bearings when we want to easily or efficiently move things.

As can be see in the graph of friction vs normal force, the ________ can be reduced by a factor of _____ by using wheels. That is, for a box weighing 20 N the friction without wheels would be _____ N and be reduce to only _____ N with wheels.


Test Prediction

I get what Mr. Hill means when he says “we take some measurements about how much friction there is when you change the surface or how hard to press the surfaces together, apply some mathematics to find a pattern, and than we can predict the amount of friction there will be in a new case involving the same surfaces”.


Test Prediction

Science works!We can find a pattern in nature and use it to

accurately predict the future.

Wild guess sometimes close, sometimes not. How do you know which of these it is? With careful investigation we can predict the future again and again – with some level of confidence.


SQPRRS 6.6 & 6.7


Due Tomorrow Rd 6.6 & 6.7 Q’s: 13,15,17,19,38,47



Agenda: Short Answer QuizFree Fall, Air Resistance,

& Terminal VelocitySeeing Forces in Motion Graphs

Skywork Question:

Due Next Class Packet Page 8Due Today Rd 6.6 & 6.7 Q’s: 13,15,17,19,38,47




Science.



Short Answer Quiz


New Idea: Free Fall

Physics Physics

Physics

When a book, two books, and a crumpled sheet of paper are dropped at the same time rank the order in which they will hit the floor?

Why?


New Idea: Free Fall

Physics Physics

Physics

Video: What happens when remove the air?

Why?

http://www.wired.com/2014/11/dropping-objects-worlds-largest-vacuum-chamber/

http://www.wired.com/2014/11/dropping-objects-worlds-largest-vacuum-chamber/


Key Vocabulary

Free Fall: Falling without significant air resistance.

Terminal Velocity: The max speed an object can fall; since air resistance balances out the force of gravity causing the object to no longer speed up and instead it falls at a constant speed.


New Idea: Free Fall

Physics Physics

Physics

At terminal velocity: let’s draw the forces on each object, label our guess at the time of fall it reaches terminal, and the speed it has when it does reach terminal velocity.

Why?


Review Data Tables Involving Acceleration

TimeAcceleration

(m/s2)Velocity

(m/s)Distance

(m)

0

1

2

3

4

5

Skydiving


The next slide involves skydiving with air resistance in a qualitative fashion. It should noted that it will

look similar to constant acceleration at first then transition to looking like constant velocity when it reaches its terminal velocity. We will use this to

introduce on forces show up in motion graphs.


Data Tables Involving Acceleration

TimeAcceleration

(m/s2)Velocity

(m/s)Distance

(m)

0

1

2

3

4

5

Skydiving with Air Resistance


Identifying Balanced & Unbalanced Forces in Graphs







Agenda: Practice with Science Literacy

Skywork Question:

Sample Passage next Slide

Due Today Packet Page 8Due Next Class Practice Science Literacy Reading



Content ObjectiveBecome familiar with one framework of complex text.

Language ObjectiveDevelop two new strategies for reading non-fiction texts.


Sample Passage


Sample Question


Answer


Dive In: Try Stopping Distance

5 minutes, then I will model my strategies.


Teacher Model with ACT Question

As I carefully read this passage, I will talk out loud the ideas and strategies I use.


Teacher Guides ACT Question

You work through a passage a notice what strategies you use and where you get stuck. First attempt to see if any strategy we discussed will help if not then ask me.


Teacher Steps-Aside ACT Question

No short-cuts you must practice to get better – but be intentional about your practice or it is wasted.

Of course, I will help you but you are really seeing what you are capable of here.


Day 10Physics - Mr. Hill

Agenda:Applying Forces

to a BridgeReview Force Unit

Due Today Science Literacy QuestionDue Next Class Review Sheet

Skywork Question:Think of an object that would fit for each of the following 3 scenarios:You lightly push and it doesn’t move.You lightly push and it barely moves at a constant speed.You lightly push and it quickly accelerates away.




Science.



Finding Fnet and the resulting Acceleration

3 N

4 N

Mass is 2 kg


2kg


6 N

8 N



A 3D example

Push: 3 N to the right

Push: 4 N BackwardsMass of block = 0.1 kg

Support Force: 1 N upWeight: 1 N Down


Force Situation that will come up in bridge project

Wall Wall

Beam ( 20 kg)

10 kg

Wall Wall

Beam ( 20 kg)

Wall Wall

Beam ( 20 kg)

10 kg

Wall Wall

Beam ( 20 kg)

10 kg









Ground, Right

Ground, left

50N

ca b

d


Ground, Right

Ground, left

50N

ca b

d

1. Identify the forces acting inside beams A through D

2. Assuming that each beam has negligible mass (meaning that you do not have to think about it when calculating the weight) find the Weight that is being supported by the two support walls.


Review Force Unit


Pattern: LinearAcceleration vs Net Force

When Force is doubled, acceleration is doubled

2

2

4

4

so when F F , a a

and when F F, a a


Pattern: InverseAcceleration vs Mass

When mass is doubled, acceleration will decrease by half4

42

2

so when m m, a a

and when m m, a a


In an experiment, you use a spring scale to pull a 0.5 kg wood block. You observe the block does not move at first, even when you pull with 2.0 N of force. Immediately after pulling the slightest bit harder the block begins to accelerate.



Revisiting These Scenarios

Make your cartoons quantitative for the three scenarios with a cyclist:1. Cyclist pedals kind of strong to go a constant 10







Analyzing Surprising Situations with ForcesErin says “Mr. Hill that stuff about interaction can’t be

right. When I drop a basketball it falls to the earth, the earth doesn’t also fall towards the basketball.”

Think. Pair. Share. Write.

Mass of Basketball 0.6 kgMass of Earth 6000000000000000000000000 kg

Force of interaction on each other W = mg = 6 NWhat impact will that have in changing each of their motions?

What sort of acceleration is involve for each? What about of time is the change happening for? What will be the net movement of each in this time?



Newton’s Three Laws


Review Sheet


End

Below is optional material, not used this year


Do all Forces Feel the SamePressure

Bed of Nails Video


Day 11Physics - Mr. Hill

Agenda: Air Resistance Experiment

Upcoming This Friday➢ Test on Energy & Forces

Skywork Question:If there is no air resistance all objects accelerate at 10 m/s2, but what happens if there is air resistance?

Sketch a graph of Fnet vs time for a book and a coffee filter are dropped off the stadium 15 m high.

Due Today Packet 8,2,7Due Tomorrow Packet 13




Science.



Experimenting with Air Resistance

Wild Guess: How long will it take a coffee filter and a book to fall 4.5 meters?

(Observation – )

Research Question: How air resistance affects Fnet and velocity of

objects?


Experimenting with Air ResistanceHypothesis:

1) Sketch in graph form (think about one set-up from

previous slide then think doubling or halving the width)

v

t

• book

◆ coffee filter



Variables:1. Identify the independent variables

2. Identify the dependent variables




Method:1. Experimental set-up




Experimenting with Air Resistance Value of controlled variables: Book = kg Filter = kg

ObjectHeight Fell(m) +/- 0.02

Max Velocity (m/s) +/- 0.2 Average Max Velocity

(m/s) +/- 0.2Trial 1 Trial 2 Trial 3

Filter

Book


Energy: How Height affects Speed

Height (m) +/- 0.02

Time to Travel 2 m (s) +/- 0.4 Average Time (s)+/- 0.3

Velocity (m/s)Trial 1 Trial 2 Trial 3

0.00

0.80

Y X

Documents

Day 1 - A "Patterns" Approach to Physicslennoxphysics.weebly.com/uploads/3/0/9/4/...forces_fp.pptx.pdf · Vectors WS Begin Defining Newton’s Laws New Unit ... Be able to identify