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# Energy, Work, and Power Review

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### Energy, Work, and Power Review

1. 1. Energy and Power
2. 2. <ul><li>1. Energy is the ability to cause __________. </li></ul>
3. 4. 2. Energy in the form of motion is . . .
4. 5. <ul><li>3. Draw an example of kinetic energy </li></ul>
5. 6. <ul><li>4. Write this down: </li></ul><ul><li>KE = ½ mv 2 </li></ul><ul><li>(don’t forget to divide by 2) </li></ul>
6. 7. <ul><li>KE = ½ mv 2 </li></ul><ul><li>KE = mv 2 </li></ul><ul><li>2 </li></ul><ul><li>KE = mvv </li></ul><ul><li>2 </li></ul>
7. 8. <ul><li>5. If a man has a mass of 80 kg </li></ul><ul><li>and is falling at 10 m/s , </li></ul><ul><li>what is his kinetic energy? </li></ul>
8. 9. <ul><li>6. Kinetic energy depends on . . . </li></ul>
9. 11. <ul><li>AND </li></ul>
10. 13. <ul><li>7. The S.I. unit for energy is the __________. </li></ul>
11. 15. <ul><li>8. Energy stored in a motionless object is . . . </li></ul>
12. 16. <ul><li>9. What are the three forms </li></ul><ul><li>of potential energy? </li></ul>
13. 17. <ul><li>Gravitational Potential Energy (GPE) </li></ul>
14. 18. <ul><li>Having gravitational energy usually leads to a change in kinetic energy . . . </li></ul>
15. 20. <ul><li>10. Draw an example of GPE </li></ul>
16. 21. <ul><li>Jabba the Hutt vs. Mr. T </li></ul><ul><li>on the Empire State Building </li></ul>
17. 22. <ul><li>11. Who has more GPE? </li></ul><ul><li>WHY?? </li></ul>
18. 23. <ul><li>12. What two factors affect GPE? </li></ul>
19. 24. vs.
20. 25. vs.
21. 26. <ul><li>13. Write this down: </li></ul><ul><li>GPE = mgh </li></ul><ul><li>(gravity = 9.8 m/s 2 ) </li></ul>
22. 27. <ul><li>14. What is the GPE of a girl on a roller coaster if her mass is 70 kg and her height off the ground is 100 meters ? </li></ul>
23. 28. <ul><li>Chemical Potential </li></ul>
24. 29. <ul><li>15. Draw an example of chemical potential </li></ul>
25. 30. <ul><li>Elastic potential </li></ul>
26. 31. <ul><li>16. Draw an example of elastic potential </li></ul>
27. 32. <ul><li>Energy just changes from </li></ul><ul><li>one form to another. </li></ul>
28. 33. <ul><li>17. What types of energy are being transferred in this picture? </li></ul>
29. 34. <ul><li>18. What types of energy are being transferred in this picture? </li></ul>
30. 35. <ul><li>19. What types of energy are being transferred in this picture? </li></ul><ul><li>(Pretend the sled is at the top of a hill.) </li></ul>
31. 36. <ul><li>20. What law states that energy can never be created or destroyed, only transferred to another form? </li></ul>
32. 37. <ul><li>Law of Conservation of Energy </li></ul>
33. 38. <ul><li>21. Mechanical Energy = ______ + ______ </li></ul>
34. 39. <ul><li>22. Friction converts mechanical energy into __________ energy. </li></ul>
35. 41. <ul><li>23. What is the transfer of energy that occurs when a force makes an object move? </li></ul>
36. 42. <ul><li>24. For work to occur, an object must _____. </li></ul>
37. 43. <ul><li>25. Is #9 doing work on #93? </li></ul>
38. 44. <ul><li>26. For work to occur, the motion of the object must be in the _____________ as the applied force. </li></ul>
39. 45. <ul><li>27. Is the man receiving the punch doing work? </li></ul><ul><li>Why or why not? </li></ul>
40. 46. <ul><li>28. Write this down </li></ul><ul><li>w = Fd </li></ul><ul><li>w = force x distance </li></ul>
41. 47. <ul><li>29. If this dude lifts a weight with 900 N of force upward 3 meters , what work has he done? </li></ul>
42. 48. <ul><li>30. Draw a picture of a person doing work on an object </li></ul>
43. 49. <ul><li>The story of kinetic and potential energy </li></ul>
44. 50. <ul><li>31. What is the amount of work done in a certain amount of time? </li></ul>
45. 51. <ul><li>32. Who probably uses more power, A or B? </li></ul>A B
46. 52. <ul><li>W </li></ul>33. What is the S.I. Unit for power?
47. 53. <ul><li>34. List and define Newton’s 3 laws of motion </li></ul>
48. 54. <ul><li>35. What is the difference b/w a theory and a scientific law? </li></ul>
49. 55. <ul><li>P.S. Know your experimental variables: </li></ul><ul><li>Independent, Dependent, Constant, </li></ul><ul><li>and </li></ul><ul><li>Control </li></ul>