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In: 10.4.10 Work

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.

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In: 10.4.10 Work

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  1. 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?

  2. Questions: • How can we determine if work is happening?

  3. Research: • Work = Force X Distance

  4. Hypothesis: • If… then work is being done Because…

  5. Experiment: • Go to each stations. Complete the activity, and record if what you did was work or not • DATA CHART:

  6. Analysis: • Which station do you think you did the most work at? • Explain why that station was the most work. • What is 0 times any other number? 4. If work is Forces times Distance, if you didn’t move anything did you do work?

  7. Conclusion:write in your Summary Explain why no matter how much force you apply on a non-moving object you are not doing work.

  8. Steps to Calculating work • Identify the numbers with their units. • Determine if the unit tells you if it is force, distance, or work • Put the numbers in the correct place in the equations W= F x D • Solve

  9. 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.

  10. 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.

  11. Question: • Will an inclined plane reduce the amount of work needed to move an object.

  12. Research • Inclined plane: a simple machine with a flat slanted edge (a ramp) • Video Clip

  13. Hypothesis: • If I use an incline plane to …. then work … because…

  14. Experiment: • Create the chart:

  15. Analysis • How much work was done to lift the object straight up? • How much work was done to drag the object up the inclined plane. • Which one do you think would be easier to do if the object was 200 lbs? • Is there a difference between work and effort?

  16. Conclusion WRITE in your Summary Tell me if your hypothesis is valid or invalid. Explain why!

  17. Recall: Effort = force not work • Summary : (conclusion) • Out: Explain how Egyptians used an incline plane to build the pyramids.

  18. 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.

  19. Question: • can we increase the mechanical advantage of a lever?

  20. 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

  21. Hypothesis: • If I change…. then I will increase the…. Because…

  22. Experiment: • Create the chart • Calculate the mechanical advantage.

  23. Analysis: • Which lever in this lab had the greatest mechanical advantage? • Do you think you can change the mechanical advantage of a lever?

  24. Conclusion WRITE in your Summary Tell me if your hypothesis is valid or invalid. Explain why!

  25. Recall: Mechanical Advantage = effort forceresistance force • Summary: Conclusion • Out: Draw and label each class of lever

  26. 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? 5m 1 m

  27. 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?

  28. 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

  29. 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

  30. Recall: Rate means how fast • Summary: Explain how words power and work relate. • Out: Identify all simple machines in this picture.

  31. 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?

  32. Board Game

  33. 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.

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