1. Mechanical Systems

2. Formulas
Symbols and Units
Levers
Wheel and Axle
Under Pressure
Hodge
Podge
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3. This formula calculates the amount of work done by a simple machine

4. Multiply force by the distance moved
W=F x D

5. What is the formula for “Pressure”?

6. P= F (force)
A ( Area)

7. What is the formula for Mechanical Advantage in terms of forces?

8. MA = Load Force
Effort force

9. What is the formula for Mechanical Advantage if you are given measurements (m)?

10. M.A = Effort Arm
Load Arm

11. How do you determine the Mechanical Advantage of a Pulley system?

12. The Mechanical Advantage of a pulley system is EQUAL to the number of supporting ropes off of the moveable pulley.

13. What is the correct unit for Pressure?

14. Newtons per metre squared
N/m2
Newtons per metre squared

15. What is the symbol and equivalent unit for the Pascal?

16. Pa and N/m2

17. Work is calculated in this.

18. J -- Joules

19. Force is measured in….

20. What are Newtons (N)

21. These units are used in Mechanical Advantage

22. There are no units used in Mehcanical Advantage – it is a RATIO.

23. This class or classes of levers exert a LOAD force greater than the EFFORT force?

24. What are Class 1 levers?
What are Class 2 levers?

25. These types of levers can give a M. A
These types of levers can give a M.A. that is greater than 1 if the Load Arm (LA) is shorter than the Effort Arm (EA).

26. What are Class 1 and 2 levers?

27. If the Load Arm (LA) and Effort Arm (EA) are EQUAL in Class 1 and 2 levers they have this type of M.A.

28. What is M.A of 1?

29. This type of lever is built for speed and has a Mechanical Advantage of LESS than 1.

30. What is a Third Class Lever?

31. This type of lever requires a large force over a small distance.

32. What is a third class lever?

33. This is the formula to determine the speed ratio in gears.

34. Speed Ratio= Number of driver gear teeth Number of follower gear teeth
What is:
Speed Ratio= Number of driver gear teeth
Number of follower gear teeth

35. In a winch the radius of the wheel is also considered the

36. What is Load Arm?

37. You get this type of advantage in a wheel and axle when the Effort Arm is longer than the load arm

38. What is force advantage?

39. What is the speed ratio if your Driving Gear has 60 teeth and your Following gear has 6 teeth?

40. What is 10?

41. This is a very complex pulley system in a combination of fixed and moveable pulleys

42. What is a Block and Tackle?

43. This Law states: Pressure exerted on a contained fluid is transmitted undiminished in all directions in the fluid and perpendicular to the walls of the container

44. What is Pascal’s Law?

45. What are some examples of equipment to spread force over a large area?

46. What are seat belts, air bags, helmets, shoulder pads etc.

47. This formula helps determine the Mechanical Advantage in a hydraulic jack.

48. What is M.A. = Output Force
Input Force

49. Why is there such a large M.A?

50. Every square unit receives the same amount of force
Every square unit receives the same amount of force. The output piston has many more square units of area; therefore, it receives MORE force!

51. What is the M.A. of a hydraulic lift if the Load was 2000N and the Effort force was 100?

52. M.A = = 20
100

53. This is the “Work Output by a machine divided by the Work Input x 100%

54. What is efficiency?

55. When doing work, this type of slanted surface reduces the force you need to exert on something.

56. What is an Inclined Plane?

57. When bouncing a ball – it is at this point that you will find it’s maximum potential energy.

58. What is the top or highest height the ball reaches?

59. Name three examples where friction is useful

60. Answer will vary, rosin baseball, brakes on a bike, etc.

61. Every time you squeeze your toothpaste you are applying this law.

62. What is Pascal’s Law?

63. Daily Double