1. Simple Machine Quiz Review

2. 1.
List and explain the mechanical advantage of the 6 simple machines.

3. Lever Inclined Plane Wheel and Axle Pulley Wedge Screw
MA =
Length to Effort (LE)/Length to Load (LR)
Length of Plane (L)/Height of Plane (H)
Wheel and Axle
Pulley
Radius of Effort (LE)/Radius of Load (LR)
number of ropes that support the pulley
Wedge
Screw
Length of slope (L)/thickness of wedge (H)
Circumference (C) / pitch (p)

4. 2. Draw and identify parts of the simple machines.

5. Lever Effort force Input force Resistance force Effort distance
Output force
Resistance distance
Fulcrum
MA = effort distance/resistance distance
MA = resistance force/effort force

6. Incline plane Resistance distance Input force Effort distance
Weight = output force
MA = effort distance/resistance distance
MA = resistance force/effort force

7. Pulley Input force Weight = output force Effort distance
Resistance distance
MA = effort distance/resistance distance
MA = resistance force/effort force
MA = numbers of support on the weight

8. Wheel and Axle Effort force Radius of the wheel effort distance
Radius of the axle
resistance distance
MA = radius of the wheel/radius of the axle
MA = resistance force/effort force
Weight = resistance force

9. 3.
How do machines make doing work easier?

10. Machines can either multiply the input force and change the direction of the input force.

11. 4.
What is the cost for making work easier?

12. The cost is distance over which the input force is applied.

13. 5.
Even though machines make work easier. What can a machine not do?

14. Machines cannot increase or decrease the amount of work/energy in a system.

15. 6. Given a 4-meter long incline, what is the height in which the incline must be placed to get a mechanical advantage 4? 2? and 1?

16. The MA of an incline is MA = length of the slope/the height of the incline. 4 = 4/h  h = 1 meter 2 = 4/h  h = 2 meters 1 = 4/h  h = 4 meters

17. 7.
A screw that has 5 threads per cm. If a screwdriver has a radius of 1.25 cm, then what is the mechanical advantage of the screwdriver?

18. MA = circumference of the handle/pitch MA = 2p(1. 25) / (1/5) MA = 12
MA = circumference of the handle/pitch MA = 2p(1.25) / (1/5) MA = 12.5p = 39.3

19. 8.
Explain the difference between IMA and AMA.

20. Ideal Mechanical Advantage 1. a
Ideal Mechanical Advantage 1. a. A simple machine would be considered ideal if it had no friction that’s because some of the effort that is put into the machine is wasted in overcoming friction. b. Ideal Mechanical Advantage has the symbol IMA. c. Ideal Mechanical Advantage can be determined by the following equation: ideal mechanical advantage = Actual Mechanical Advantage 2. a. Actual machines have friction. They are not as have as high of a mechanical advantage as ideal machine because some of the effort is lost in overcoming friction. b. Actual Mechanical Advantage has the symbol of AMA. c. Actual Mechanical Advantage can be determined by the following equation: actual

21. 9.
What do the IMA and AMA have to do with how efficient a machine is?

22. The ratio of AMA to IMA times 100 gives the percentage of efficiency of a machine.

23. 10.
If two students were playing on a seesaw and one student has twice the mass of the other student, explain how to balance the two students on the seesaw.

24. The heavier student would be place half of the distance to the fulcrum as the lighter student or the lighter student placed twice the distance to the fulcrum as the heavier student.
50 kg
25 kg
10 m
5 m
Mgd = mgD
Md = mD
50 (5) = 25 (10)
250 J = 250 J

25. 11.
Explain why having a load at the furthest end from the fulcrum of a lever make it an inefficient system of using a lever.

26. 200 N
100 N
25 m
50 m

27. 12.
A lever used to lift a heavy box has an input arm of 4 meters and an output arm of 0.8 meters. What is the mechanical advantage of the lever?

28. 12.
A lever used to lift a heavy box has an input arm of 4 meters and an output arm of 0.8 meters. What is the mechanical advantage of the lever?

29. 13.
What is the mechanical advantage of a lever that has an input arm of 3 meters and an output arm of 2 meters?

30. 13
What is the mechanical advantage of a lever that has an input arm of 3 meters and an output arm of 2 meters?

31. 14.
A lever with an input arm of 2 meters has a mechanical advantage of 4. What is the output arm’s length?

32. 14.
A lever with an input arm of 2 meters has a mechanical advantage of 4. What is the output arm’s length?

33. 15.
A lever with an output arm of 0.8 meter has a mechanical advantage of 6. What is the length of the input arm?

34. 15.
A lever with an output arm of 0.8 meter has a mechanical advantage of 6. What is the length of the input arm?

35. 16.
A rake is held so that its input arm is 0.4 meters and its output arm is 1.0 meters. What is the mechanical advantage of the rake?

36. 16.
A rake is held so that its input arm is 0.4 meters and its output arm is 1.0 meters. What is the mechanical advantage of the rake?

37. 17.
A broom with an input arm length of 0.4 meters has a mechanical advantage of 0.5. What is the length of the output arm?

38. 17.
A broom with an input arm length of 0.4 meters has a mechanical advantage of 0.5. What is the length of the output arm?

39. 18.
A child’s toy rake is held so that its output arm is 0.75 meters. If the mechanical advantage is 0.33, what is the input arm length?

40. 18.
A child’s toy rake is held so that its output arm is 0.75 meters. If the mechanical advantage is 0.33, what is the input arm length?

41. 19.
A 5-meter ramp lifts objects to a height of 0.75 meters. What is the mechanical advantage of the ramp?

42. 19.
A 5-meter ramp lifts objects to a height of 0.75 meters. What is the mechanical advantage of the ramp?

43. 20.
A 10-meter long ramp has a mechanical advantage of 5. What is the height of the ramp?

44. 20.
A 10-meter long ramp has a mechanical advantage of 5. What is the height of the ramp?

45. 21.
A ramp with a mechanical advantage of 8 lifts objects to a height of 1.5 meters. How long is the ramp?

46. 21.
A ramp with a mechanical advantage of 8 lifts objects to a height of 1.5 meters. How long is the ramp?

47. 22.
A child makes a ramp to push his toy dump truck up to his sandbox. If he uses 5 newtons of force to push the 12-newton truck up the ramp, what is the mechanical advantage of his ramp?

48. 22.
A child makes a ramp to push his toy dump truck up to his sandbox. If he uses 5 newtons of force to push the 12-newton truck up the ramp, what is the mechanical advantage of his ramp?

49. 23.
A ramp with a mechanical advantage of 6 is used to move a 36- newton load. What input force is needed to push the load up the ramp?

50. 23.
A ramp with a mechanical advantage of 6 is used to move a 36- newton load. What input force is needed to push the load up the ramp?

51. 24.
Gina wheels her wheelchair up a ramp using a force of 80 newtons. If the ramp has a mechanical advantage of 7, what is the output force (in newtons)?

52. 24.
Gina wheels her wheelchair up a ramp using a force of 80 newtons. If the ramp has a mechanical advantage of 7, what is the output force (in newtons)?

53. 25.
Challenge! A mover uses a ramp to pull a 1000-newton cart up to the floor of his truck (0.8 meters high). If it takes a force of 200 newtons to pull the cart, what is the length of the ramp?

54. 25.
Challenge! A mover uses a ramp to pull a 1000-newton cart up to the floor of his truck (0.8 meters high). If it takes a force of 200 newtons to pull the cart, what is the length of the ramp?