2. 100 200 300 400 500 By Any Name Work It Out Little Help Here Forcing the Issue K.I.S.S. Strong Arm Tactics

3. What must happen in order for a person to do work? A 100

4. 1)A force must be applied to the object 2)The object must move 3)The object must move in the direction of the force A 100

5. Which of the following is an example of work: reading this question, thinking about the answer, pushing the egg, or speaking the answer? A 200

6. Pushing the Egg A 200

7. Why is carrying a bag of groceries into the house not considered work? A 300

8. Because the direction of the force you apply to the bag is not the same as the direction the bag is moving A 300

9. What is the formula for work? A 400

10. Work = force x distance A 400

11. 1)A student spins the dial on her locker, then 2)pulls up on the latch to open the locker. 3)the student pulls out her science book, and 4)places it on the ground. In which step(s) above does the student do work? Explain your answer. A 500

12. The student does work when spinning the dial, pulling up on the latch, and picking up the book, because the student applied a force which caused the object to move in the direction of the force. A 500

13. How much work was done in the above sitation? B 100

14. 5 N x.1 m =.5 Joules B 100

15. How much work was done in the above situation? Explain your answer. B 200

16. Since none of the students are moving, there is no work being done in the classroom B 200

17. Mechanical Advantage compares which two things? B 300

18. Mechanical Advantage compares the input force applied to the machine and the output force applied by the machine. B 300

19. What is the mechanical advantage of a machine that multiplies the input force: 1? B 400

20. The mechanical advantage of a machine that multiplies the input force is greater than 1 (>1) B 400

21. Name two simple machines that would multiply the input force. B 500

22. Inclined planes, wedges, screws, 2 nd class levers, some wheel and axles, and pulley systems all multiply the input force B 500

23. Any device that makes work easier or more efficient is called what? C 100

24. A machine C 100

25. Name two of the three ways machines can make work easier or more efficient. C 200

26. 1) The machine can multiply input force. 2) The machine can multiply input distance. 3) The machine can change the direction of the input force. C 200

27. How does using a machine affect the amount of work a person needs to do? C 300

28. It does not change the amount of work the person needs to do. Using a machine does not affect the amount of work done. C 300

29. DAILY DOUBLE C 400 DAILY DOUBLE Place A Wager

30. What is the ideal efficiency of a machine? C 400

31. Ideal mechanical efficiency is 100 %. C 400

32. What happens to efficiency when friction increases? C 500

33. As friction increases, efficiency decreases. C 500

34. Which pair of objects would be more strongly attracted due to gravity? Explain your answer. D 100

35. Because the objects in pair A appear to have more mass, they will have a stronger attraction die to gravity, according to the universal law of gravitation. D 100

36. What could you do to the objects in pair B so they have the same gravitational pull as the objects in pair A? D 200

37. The objects in pair B should be moved closer together, which would increase their gravitational pull. D 200

38. If they were dropped at the same time, which would fall the fastest: a piano, a bowling ball, or a person? D 300

39. All three objects would fall at the same rate, since their attraction to Earth is the same. D 300

40. D 400 What could you do to increase the amount of friction in a situation?

41. D 400 Make surfaces rougher, increase speed, increase pressure, remove wheels, etc.

42. D 500 Why does a person skydiving fall slower once they open their parachute?

43. D 500 Opening the parachute increases the air resistance (friction) of the person, and the increased friction is able to balance gravity at a lower speed.

44. Which simple machine does the above best represent? E 100

45. A slide is an example of an inclined plane. E 100

46. What is the axle in the above machine? E 200

47. The handle in the middle is the axle. E 200

48. E 300 What simple machine is best represented by the diagram above?

49. E 300 The base of the light bulb is an example of a screw

50. E 400 What are wedges typically used for?

51. E 400 Separating objects or holding objects together

52. An inclined plane allows you to apply less force to lift an object. What is the disadvantage of an inclined plane? E 500

53. You must apply the force over a greater distance. E 500

54. Which of the levers above are 1 st class levers? F 100

55. The see-saw, hammer, and the scissors are all 1 st class levers? F 100

56. F 200 Which of the levers above are 2 nd class levers?

57. The nutcracker and wheelbarrow are 2 nd class levers F 200

58. F 300 Which of the levers above are 3 rd class levers?

59. The shovel and ping pong paddle are 3 rd class levers F 300

60. F 400 Give three examples of 2 nd class levers from this classroom.

61. The doorknobs, the front and back doors, the cabinet doors, the front of a binder, the 3 hole punch, etc. F 400

62. F 500 When you use a spoon to eat, which class of lever is it? What is the fulcrum?

63. When using a spoon to eat, you are using a 3 rd class lever. The fulcrum of the lever is your wrist (or elbow). F 500

64. The Final Jeopardy Category is: Compound Machines Please record your wager. Click on screen to begin

65. Name one example of each simple machines, and two classes of levers, from the situation above. Click on screen to continue

66. Inclined Plane – the hill Wedge – the helmets Screw – screws on the bike 1 st class lever – bike handlebars 3 rd class lever – bikers’ arms and legs Wheel and Axle – back tire of bike, bike pedal Pulley – bike chain Click on screen to continue

67. Thank You for Playing Jeopardy! Game Designed By C. Harr-MAIT