2. WorkMathPowerMachinesMisc 10 20 30 40 50

3. Question 1 - 10 What is the SI unit for work?

4. Answer 1 – 10 Joule

5. Question 1 - 20 What is the formula for work?

6. Answer 1 – 20 W = F x d

7. Question 1 - 30 What is work?

8. Answer 1 – 30 The force acting upon an object to cause displacement

9. Question 1 - 40 How much work is done if an object does not move?

10. Answer 1 – 40 None

11. Question 1 - 50 How do these measurements compare: 5 J 5 N/m

12. Answer 1 – 50 Same

13. Question 2 - 10 Calculate the machanical advantage of a wheel and axle where the wheel has a radius of 10 and the axle has a radius of 2

14. Answer 2 – 10 5

15. Question 2 - 20 Two people lift two boxes having the same weight. Person 1 lifts his box in 6 seconds while Person 2 lifts his box in 3 seconds. Compare the power being exerted by these two people in this situation.

16. Answer 2 – 20 Person 2 uses twice or double the power.

17. Question 2 - 30 The formula for power is P = work/time. If a weight lifter does 650 joules of work in 3 seconds pressing the bar over his head, how much power does he use?

18. Answer 2 – 30 216.67 W

19. Question 2 - 40 How much work is done while you raise a 50 Newton rock 5 m above the floor?

20. Answer 2 – 40 250 J

21. Question 2 - 50 A person pushes on a wall with 700 newtons of force for a minute. During this exertion the wall does not move. Describe the amount of work being done on the wall.

22. Answer 2 – 50 NONE

23. Question 3 - 10 What is the SI unit for Power?

24. Answer 3 – 10 Watt

25. Question 3 - 20 An increase in power means there was a … – Increase in time – Decrease in work – Increase in distance – Increase in work

26. Answer 3 – 20 Increase in work

27. Question 3 - 30 Identify the formula to find Power.

28. Answer 3 – 30 P = W/t

29. Question 3 - 40 What is power?

30. Answer 3 – 40 The rate at which work is done.

31. Question 3 - 50 How do you increase power output?

32. Answer 3 – 50 Work faster / complete it in less time.

33. Question 4 - 10 What type of simple machine does a pencil sharpener contain?

34. Answer 4 – 10 Wheel and axle

35. Question 4 - 20 Which of the following can machines such as levers and pulleys do? – Change directions of forces – Multiply forces – Be used to gain mechanical advantage in work output – All of the above

36. Answer 4 – 20 All of the above

37. Question 4 - 30 What type of simple machine would NOT increase force?

38. Answer 4 – 30 A fixed pulley

39. Question 4 - 40 Simple machines transfer what?

40. Answer 4 – 40 Force

41. Question 4 - 50 Which of the three things listed below can machines do? – Increase force applied to an object – Increase distance over which force is applied – Change the direction of a force – All of the above

42. Answer 4 – 50 All of the above

43. Question 5 - 10 Name a 1 st class lever example

44. Answer 5 – 10 Seesaw Crowbar/prybar

45. Question 5 - 20 The equation MA = output force / input force is for which type of mechanical advantage?

46. Answer 5 – 20 AMA

47. Question 5 - 30 MA = input distance / output distance is which type of mechanical advantage?

48. Answer 5 – 30 IMA

49. Question 5 - 40 Work is described as: – The ability to transfer heat – The ability to convert energy – The force applied that gives an object weight – The force applied to an object times the distance the object moves

50. Answer 5 – 40 The force applied to an object times the distance the object moves

51. Question 5 - 50 What is the mechanical advantage of the following pulley

52. Answer 5 – 50 MA = 4