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Student Worksheet

Name (s) : _________________________ __________________________________ Section: ______________________ Date: ______________________

Conservation of Energy

Getting started:

3. Using the information given on the screen, rewrite these formulas in sentence form: GPE = wh W = mg GPE = mgh Lab instructions: Click [start] to start the car rolling on this ride. 2.After discussing with your partner, describe any changes in the movement of the car from the top of the first hill to the top of the loop.

Click [start] to start the car rolling. Click on the [record] during the ride to get readings of its height and velocity. Repeat until you have data from at least 8 different positions. 3. Record the speed and height for each position on Table A.

Data Collection

Table A

Height

Velocity

Mass

Discuss with your partner, then record your answers. 3. How can you calculate the kinetic energy and the potential energy of the car at any point on the ride?

3. Select 5 positions from Table A and calculate the potential energy and kinetic energy of the car for each of these positions.

Table B

Height

Potential Energy Mass X g X height

Kinetic Energy ½ X mass X velocity2

Total Energy

6. How do the total energy sums compare with each other? Use complete sentences.

Graphing

7. Use the height of each position and the kinetic energy values from Table B to complete Graph A. Graph A

8. Use the height of each position and the potential energy values from Table B to complete Graph B. Graph B

9. How do these two graphs compare?

10. What happens to the potential energy of the car as its position goes down?

11. What happens to the kinetic energy of the car as its position gets lower?

Discuss this with your partner, then answer these questions using complete sentences. 12. Why is the kinetic energy changing?

13. Where is the car moving fastest?

14. Where is the potential energy of the car the lowest?

Why?

15. As a team, create a statement that explains the relationship between kinetic energy and potential energy and total energy within a system.

Changing the Ride 16. Predict what will happen if you increased the height of the first hill.

17. Increase the height of the first hill and record you data.

Table C (Increased height of 1st hill)

Height

Speed

Height of 1st Hill

18. How do these figures compare with the data on Table A?

19. How did your prediction compare with the results?

20. Predict what will happen if you left the height of the first hill the same as on Table C but changed the slope of the hill.

21. Change the slope of the hill and record the data collected. Table D (Changed Slope) Height Speed Height of 1st hill Length of slope section

22. How do these figures compare with the data from Table C?

23. Use complete sentences to describe how well your predictions matched the data in Table D.

24. Table E Height Speed Height of 1st hill Length of Slope Section

25. How do these figures compare with the data in Table D?

26. Describe, using complete sentences, how well your prediction matched the data in Table E.

27. Select settings for the ride. Height of 1st hill: _______________________ Length of slope section: __________________

28. Predict the outcome of the changes you made.

29.Collect data for this run: Table F Height Speed

30. Describe, using complete sentences, how well your prediction matched the data in Table F.

With your partner, compose a general statement to explain what results you could expect when changing each one of the dimensions of the ride. 31. Changing the height of the 1st hill.

32. Changing the slope of the 1st hill.

33.Collect data for this run: Table G Height Speed

34. Describe, using complete sentences, how well your prediction matched the data in Table F.

With your partner, compose a general statement to explain what results you could expect when changing each one of the dimensions of the ride. 35. Changing the height of the 1st hill.

36. Changing the slope of the 1st hill.

37. Collect data for this run: Table H Height Speed

38. Describe, using complete sentences, how well your prediction matched the data in Table F.

With your partner, compose a general statement to explain what results you could expect when changing each one of the dimensions of the ride. 39. Changing the height of the 1st hill.

40. Changing the slope of the 1st hill.

Other Factors to Consider

41. What other factors have an effect on this ride?

42. What effect would these other forces have on the speed at which the ride travels?

43. How would this effect the energy of the ride?

Extension:

45. With your partner, describe what might happen if the second hill of a roller coaster were only half as high as the first hill.

46. What would you expect to happen if the loop was taller than the first hill?

47. What if friction was present? Would energy still be conserved? What additional form of energy would appear?

48. When you ride a roller coaster, where does the track usually curve? Is it at the top or at the bottom? Explain why the curves are placed where they are and what might happen if they were placed at the opposite position.

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