View
26
Download
0
Category
Preview:
DESCRIPTION
In: 10.4.10 Work . Obj : We will do various activities to determine if work is being done. TEK: 7.7A Warm up: What is the SI unit you need to measure the length of the football field? . Questions: . How can we determine if work is happening? . Research: . Work = Force X Distance. - PowerPoint PPT Presentation
Citation preview
In: 10.4.10 Work • Obj: We will do various activities to determine
if work is being done. • TEK: 7.7A • Warm up: What is the SI unit you need to
measure the length of the football field?
Questions: • How can we determine if work is happening?
Research: • Work = Force X Distance
Hypothesis: • If … then work is being done Because…
Experiment:1. Go to each stations. Complete the activity, and record if
what you did was work or not2. DATA CHART:
Activity Name Did you do work (yes or no)1. Lift a ruler2. 15 sec wall squat3. Lifting the counter4. Touching your toes
Analysis: 1. Which station do you think you did the
most work at? 2. Explain why that station was the most
work. 3. What is 0 times any other number? 4. If work is Forces times Distance, if you
didn’t move anything did you do work?
Conclusion:write in your Summary
Explain why no matter how much force you apply on a non-moving object you are not doing work.
Steps to Calculating work
1. Identify the numbers with their units. 2. Determine if the unit tells you if it is force,
distance, or work3. Put the numbers in the correct place in the
equations W= F x D4. Solve
• Recall: an object in which the force is applied must be moving to be work.
• Summary (was your conclusion) • Out: Draw a picture of work, and write a
sentence explaining how the picture demonstrates work being done.
In: 10.5 inclined plane • OBJ: We will use a simple machine to show
how work is not changed but effort is changed.
• TEK: 7.7A• Warm-up: What tools would be needed if
George wanted to test how much space a rubber ball takes up.
Question:• Will an inclined plane reduce the
amount of work needed to move an object.
Research • Inclined plane: a simple machine with a flat
slanted edge (a ramp)• Video Clip
Hypothesis:• If I use an incline plane to …. then work
… because…
Experiment: • Create the chart:
Amount of force in Newtons (N)
Distance in Meters (m)
Amount of work (F X D) in Joules (J)
Lift the object straight up Drag the object up the ramp
Analysis
1. How much work was done to lift the object straight up?
2. How much work was done to drag the object up the inclined plane.
3. Which one do you think would be easier to do if the object was 200 lbs?
4. Is there a difference between work and effort?
ConclusionWRITE in your Summary
Tell me if your hypothesis is valid or invalid. Explain why!
• Recall: Effort = force not work • Summary : (conclusion) • Out: Explain how Egyptians used an
incline plane to build the pyramids.
10.6.10 Levers • Obj: We will calculate how efficient a lever is
using a ruler. • TEK: 7.7 A • Warm up: Which picture is doing work…
explain why.
Question: • can we increase the mechanical
advantage of a lever?
Research: • Lever: a simple machine that has a bar
balanced on a single point called a fulcrum. • Video clip: levers and mechanical advantage.• Mechanical advantage=length of effort arm ÷
length of resistance arm
Hypothesis: • If I change…. then I will increase the….
Because…
Experiment: • Create the chart• Calculate the mechanical advantage.
Station Distance to the load (m)
Distance to the effort (m)
Mechanical advantage
First class Lever
Second class lever
Third class lever
Analysis: • Which lever in this lab had the greatest
mechanical advantage? • Do you think you can change the mechanical
advantage of a lever?
ConclusionWRITE in your Summary
Tell me if your hypothesis is valid or invalid. Explain why!
• Recall: Mechanical Advantage
= effort force resistance force
• Summary: Conclusion
• Out: Draw and label each class of lever
10.7 Power• Obj: we will calculate the amount of power
and review by assessment. • TEK: 7.7 A, B• Warm up: What is the mechanical advantage
of this inclined plane?
1 m 5m
Question: Does the amount of time to do something effect
how much power a person has? What is an inclined plane?What is a lever? What is work? What is energy? What is force?
Research:• Power: is the rate (how fast) at which work is
done • Inclined Plane: Inclined plane: a simple
machine with a flat slanted edge (a ramp)• Lever: a simple machine that has a bar
balanced on a single point called a fulcrum. • Energy is the ability to do work. • Force is a push or pull
Flip Book • Vocabulary Words– Spring scale– Potential energy– Kinetic energy– Energy – Force – Inclined plane
– Lever– Newton’s First Law of
Motion– Unbalanced force– Balanced force– Work– Power– Joules– Watts
• Recall: Rate means how fast • Summary: Explain how words power and work
relate. • Out: Identify all simple machines in this
picture.
10.8.10 QUIZ
• We will use critical thinking skill to take a quiz. • TEK7.7• Warm up: George is 300N and can run 400m
in 60 sec. How much power does George have?
Board Game
• Recall: Work = Force X Distance • Summary: what was the hardest part of the
quiz? • Out: Draw 2 pictures. Have your neighbor
guess if the people in your pictures are really doing work or not.
Recommended