2. Let’s Play! Please listen carefully and think before answering.
Good Luck!!

4. Work
Power
GPE KE
Misc. Energy
Calculations
100
100
100
100
100
100
200
200
200
200
200
200
300
300
300
300
300
300
400
400
400
400
400
400
500
500
500
500
500
500

5. What is the unit of measurement for work?

6. Joules

7. Define ‘work’
Work 200

8. When a force causes an object to move in the direction of the force

9. Give an example of work being done.

10. Answers will vary- must include something moving in direction of applied force

11. A waiter is carrying a tray of dishes that weighs 10 N
A waiter is carrying a tray of dishes that weighs 10 N. He walks the tray to a table 5 m away. How much work does he do on the tray?
Work 400

12. 0 J

13. Work 500
Could a 225 N force and a 75N force both do 225J of work? Explain.

14. Yes. 225N x 1m = 75N x 3m= 225J

15. What is the unit of measurement for Power?

16. Watts

17. Define Power.
Power 200

18. Rate at which work is done… etc.

19. What must you know in order to calculate power? What is the formula?

20. P = work/time

21. What is the relationship between power and time?

22. As time decreases, power increases
As time increases, power decreases

23. Jim has a power output of 625W after running up a set of stairs in 10s
Jim has a power output of 625W after running up a set of stairs in 10s. How much work did he do?
Power 500

24. W= P x t
6250J

25. What factors increase GPE

26. More mass, greater height

27. At what point on an incline plane would a ball have the most GPE- why?

28. Top, greatest height, most ‘potential’

29. Which statement best explains the change in the skier’s potential energy?
a. The skier loses potential energy as she is lifted up the slope and loses potential energy as she skies down the slope.
b. The skier gains potential energy as she is lifted up the slope and maintains the same potential energy as she skis down the slope.
c. The skier gains potential energy as she is lifted up the slope and loses potential energy as she skis down the slope.
d. The skier loses potential energy as she is lifted up the slope and gains potential energy as she skis down the slope.
GPE 300

30. c. The skier gains potential energy as she is lifted up the slope and loses potential energy as she skis down the slope.

31. GPE 400
At what point does the pendulum have the greatest and least amounts of GPE? A B C

32. A= greatest, c= least

33. A diver has a 3400J of GPE after stepping up onto a diving platform that is 6.0m above the water. What is the diver’s mass in kg?
GPE 500

34. m= GPE/ gh
3400/ 9.81 x 6
57.76 kg

35. KE 100
Define KE?

36. Energy of a moving object due to motion

37. KE 200
At what point is the pendulum moving the fastest? When is the KE the greatest? C B A

38. A

39. DAILY DOUBLE
KE 300

40. A student plans to collect data needed to calculate the kinetic energy of a thrown baseball. She plans to measure the distance from pitcher to catcher, the time it takes for the baseball to arrive in the catcher’s glove, the mass of the baseball, and the circumference of the baseball.
Which of these measurements is not needed to calculate the kinetic energy
a. Measuring the mass of the ball.
b. Measuring the flight time of the ball.
c. Measuring the circumference of the ball.
d. Measuring the distance from pitcher to catcher.
KE 300

41. c. Measuring the circumference of the ball.

42. Which graph shows the kinetic energy of the space shuttle during the first few minutes of flight? (Launch time = 0)
KE 400
A B
C D

43. C

44. A rock is dropped from a high cliff until it hits the ground below
A rock is dropped from a high cliff until it hits the ground below. Which statement below best describes the relationship between the kinetic and gravitational potential energy of the rock? (Air resistance can be ignored.)
A. The gravitational potential energy the rock has at the top will be completely transformed into kinetic energy at the bottom.
B. The gravitational potential and kinetic energies of the rock remain constant the entire way down.
C. The kinetic energy decreases as the rock falls while the gravitational potential energy increases.
D. Gravitational potential energy is destroyed while kinetic energy is created through molecule interactions between the rock and the air around it as it falls.
KE 500

45. A. The gravitational potential energy the rock has at the top will be completely transformed into kinetic energy at the bottom.

46. The law of conservation of energy states that energy cannot be ___ or ____.
Misc. Energy 100

47. Created or destroyed

48. Energy systems that constantly have energy flowing into and out of them are considered ___?
Misc. Energy 200

49. open

50. Misc. Energy 300
mechanical energy is equal to…

51. PE + KE

52. Misc. Energy 500
Name at least 3 types of potential energy other than gravitational

53. Elastic, electrical, chemical, magnetic, etc…

54. Misc. Energy 400
In the Law of Conservation of energy, it is stated that energy can not be created or destroyed… only transferred or transformed. What does it mean to transfer or transform energy?

55. Transfer: pass along
Transform: change into something new

56. Formula for work
Calculations 100

57. W= F x d

58. Formula for Power
Calculations 200

59. P = W/t

60. Formula for GPE and numbers units used for all parts
Calculations 300

61. GPE = mass (kg) x free fall acceleration (9.81 m/s2) x height (m)

62. Formula for KE and units used for all parts
Calculations 400

63. KE = ½ x mass (kg) x (speed (m/s) 2)

64. Daily
Double!
Calculations 500

65. How do you isolate for speed in the KE equation?
Calculations 500

66. Square root of 2KE/m
(or explain steps…)
Or square root of KE/.5m