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.