3. NEXT

9. 300 400 500 100 200 Forces Balanced/ Unbalanced Work, work, work… Ch 4 Vocab. This ‘n That 100 200 300 400 500 400 Team One Team Two Team Three Team Four Team Five Team Six

10. A push or pull that causes motion. Show Answer

11. force 100 Back to Board

12. The force of attraction between all objects. Show Answer

13. gravity 200 Back to Board

14. What kind of force opposes motion? Show Answer

15. friction 300 Back to Board

16. What kind of force is needed to keep your nametags on the side of your desks? Show Answer

17. Magnetic Force 400 Back to Board

18. Why does Mr. Heinz only weigh 35 pounds on the moon? Show Answer

19. The force of gravity is less on the moon. Bonus (100pts): Why is the force of gravity less on the moon than Earth? 500 Back to Board Because the moon is smaller than Earth.

20. One puppy pulls on a rope toy. His sister pulls on the other end with a balanced force. Does the rope toy move? Show Answer

21. NO! Balanced forces cancel each other out, and there is no movement. 100 Back to Board

22. A baseball is sitting on the top of a cone. Are the forces balanced or unbalanced? Show Answer

23. Balanced Bonus (100pts.) How can you make the forces unbalanced? 200 Back to Board Hit the ball!

24. Mr. Doofus and Mr. Do- right are arm wrestling. Mr. Doofus exerts a force of 20 N to the left. Mr. Do- right exerts a force of 30 N to the right. What is the net force? Show Answer

25. 10 N to the right Mr. Do-right wins! 300 Back to Board

26. Why is it easer to lift a heavy weight that is under water, than on land? Show Answer

27. Buoyant forces push up on objects that are in water. 400 Back to Board

28. Use the words “buoyant force” to explain why a ping pong ball floats and a golf ball sinks? Show Answer

29. A ping pong ball floats because the buoyant force of water is greater than its weight. A golf ball sinks because the buoyant force of water is less than its weight. 500 Back to Board

30. A bar that makes it easier to move things. Show Answer

31. lever 100 Back to Board

32. True or False? Simple machines make less work. Why? Show Answer

33. False. Simple machines make work easier, not less work. 200 Back to Board

34. Which of the following demonstrates work being done? (list them on your board) Mr. Heinz pushing against a wall. Mr. Heinz hammering a nail through a board. Mr. Heinz riding his bike down the street. Mr. Heinz jumping on a trampoline. Mr. Heinz telling you to put your eyes on him. Mr. Heinz sitting on his stool. Mr. Heinz opening the door and walking out. Mr. Heinz reading science homework. Show Answer

35. 300 Back to Board Which of the following demonstrates work being done? (put a √ next to any of them) Mr. Heinz pushing against a wall. Mr. Heinz hammering a nail through a board. Mr. Heinz riding his bike down the street. Mr. Heinz jumping on a trampoline. Mr. Heinz telling you to put your eyes on him. Mr. Heinz sitting on his stool. Mr. Heinz opening the door and walking out. Mr. Heinz reading science homework.

36. Match the name of the simple machine to its picture. Show Answer 1. Inclined Plane 2. Lever 3. Wedge 4. Pulley 5. Wheel and Axle ABCDEABCDE

37. 400 Back to Board 1. Inclined Plane 2. Lever 3. Wedge 4. Pulley 5. Wheel and Axle Bonus (100pts): Which simple machine is actually 2 inclined planes put together? ABCDEABCDE

38. Which ones are compound machines? Show Answer 1 2 7 6 5 3 4

39. 500 Back to Board

40. A device, made only of a few parts that makes work easier. Show Answer

41. Simple machine 100 Back to Board

42. A ramp or sloping surface. Show Answer

43. Inclined Plane 200 Back to Board

44. A wheel with a groove for a rope. Show Answer

45. pulley 300 Back to Board

46. A device made up of 2 or more simple machines. Show Answer

47. Compound Machine 400 Back to Board

48. The balance point of a lever. Show Answer

49. Fulcrum Bonus (100pts) Draw an arrow to the fulcrum on this wheel barrow. 500 Back to Board

50. What kind of force is acting on this compass? Show Answer

51. Magnetic forces 100 Back to Board

52. 2 tow trucks pull on a bull- dozer toward the right with a force of 1000 N each. The bull-dozer pulls left with 1800 N. Are the forces balanced? Show Answer

53. NO! Bonus (100pts.) What is the net force and direction? 200 Back to Board 200 N to the right (the direction the tow trucks are pulling)

54. What type of simple machine is a door knob? Show Answer

55. Wheel and Axle 300 Back to Board

56. Which simple machine changes the direction of the force applied? Show Answer

57. A pulley You pull down on the rope, and the object goes up. 400 Back to Board

58. Show Answer

59. 500 Back to Board

60. Show Question

61. Show Answer You want to move a large, heavy box of toys up into your treehouse that is very high. It’s too heavy and awkward to carry up the rope ladder. Which simple machine would help you move it up the best ? Why?

62. A pulley is the best because it can be put together easily. An inclined plane would work, but it’s too hard to put together. To End

63. End It Nice Job! STUDY HARD!