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Mechanical Systems 3

Instructions:

Answer 50 questions in 30 minutes.
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Match each statement with the correct term.
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This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.

1. What is the mechanical advantage for a single fixed block?
A screw and a spur gear.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
1
Third class lever.

2. Gears can do a job for you by changing what three things?
To speed up the motion of resistence.
Direction - speed or size of the force applied.
The force used to overcome friction is greater than the force used to do useful work.
Increase or decrease the the speed of the applied motion.

3. What are the 4 forces?
Simple machine
Gravity - Magnetism - Friction - Recoil
To raise a house or other heavy machinery.
1

4. How is force measured in work?
In pounds.
1
Length of ramp/length of height from floor to truck
A screw and a spur gear.

5. What kind of mechanical advantage does the first and second class lever provide?
Positive mechanical advantage.
Third class lever.
A modification of an inclined plane.
Increase or decrease the the speed of the applied motion.

6. How do you find the mechanical advantage?
Find the resistance weight and divide that by the effort you need to lift the weight. M.A=R/E - This rule applies to all machines.
Third class lever.
32/8 = 4
To magnify the applied force.

7. What is the jack screw used for?
2(pie)/pitch
Same.
Two surfaces move against one another.
To raise a house or other heavy machinery.

8. Work is measured in units also known as?
To speed up the motion of resistence.
Same.
Foot- pounds
The rope that passes through your hands is greater than the distance that the load is raised.

9. An egg beater has a mechanical advantage of what?
Equals the weight of the object being hoisted.
Same.
Less than 1.
Opposite.

10. What direction does the effort and resistance move in first class levers?
Gravity - Magnetism - Friction - Recoil
Opposite.
Count the number of parts of the rope going to and from the movable block.
A modification of an inclined plane.

11. What type of lever provides a fractional mechanical advantage?
Third class lever.
With oil - grease or soap.
Equals the weight of the object being hoisted.
Shafts lying at any given angle.

12. How can you figure out the mechanical advantage of most block and falls by glance?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Work=Force*Distance
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Count the number of parts of the rope going to and from the movable block.

13. What is another way to find the mechanical advantage of an inclined plane?
To magnify the applied force.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Length of ramp/length of height from floor to truck
Direction - speed or size of the force applied.

14. A miter gear connects what?
Connects shafts having a 90 degree angle.
Feet.
Positive mechanical advantage.
Foot- pounds

15. What is an example of a third class lever?
2. Each half of the rope carries an equal amount of weight.
Magnify or reduce the force which you apply.
your arm.
45

16. What does a micrometer measure?
A few thousandths of an inch.
2. Each half of the rope carries an equal amount of weight.
Door knob.
A screw and a spur gear.

17. What is the work formula?
Door knob.
To speed up the motion of resistence.
Work=Force*Distance
In Horsepower.

18. What are first and third class levers used for?
fulcrum- weight- effort
To magnify the applied force.
Feet.
Shafts lying at any given angle.

19. hat is a screw?
With oil - grease or soap.
To magnify the applied force.
A modification of an inclined plane.
Increase or decrease the the speed of the applied motion.

20. What is the lever formula?
The change of the direction of the pull.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Simple machine
Work=Force*Distance

21. What is the ratio of any gear train?
Third class lever.
Door knob.
Opposite.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

22. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
Less than 1.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
2. Each half of the rope carries an equal amount of weight.
The rope that passes through your hands is greater than the distance that the load is raised.

23. Belt drive Gear 1 has 32 teeth and gear 2 and 3 have 8 teeth - for 1 revolution that gear 1 makes how many revolutions do gears 2 and 3 make?
To magnify the applied force.
32/8 = 4
A few thousandths of an inch.
Less than 1.

24. What is the purpose of a third class lever?
To speed up the motion of resistence.
Same.
Opposite.
Length of ramp/length of height from floor to truck

25. What is the formula for the wheel and axle?
The change of the direction of the pull.
A screw and a spur gear.
L=radius of the circle where the handle turns/l=1/2 the width of the edge of the blade = R=force of resistance offered by the screw/E=effort applied by the handle
Simple machine

26. What is the formula for the mechanical advantage of a screw?
Direction - speed or size of the force applied.
Same.
2(pie)/pitch
Gravity - Magnetism - Friction - Recoil

27. What is the theoretical mechanical advantage of any gear train?
The change of the direction of the pull.
When a resistance is overcome by a force acting through a measurable distance.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
2. Each half of the rope carries an equal amount of weight.

28. What is the mechanical advantage of a single movable block?
2. Each half of the rope carries an equal amount of weight.
The change of the direction of the pull.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

29. How is work done?
Shafts lying at any given angle.
In Horsepower.
When a resistance is overcome by a force acting through a measurable distance.
Mechanical disadvantage. Use more force than the force of the load you lift.

30. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
A modification of an inclined plane.
Same.
Mechanical disadvantage. Use more force than the force of the load you lift.
Equals the weight of the object being hoisted.

31. With a single fixed sheave what is the only mechanical advantage?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Same.
The change of the direction of the pull.
Positive mechanical advantage.

32. What is one type of second class lever?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Wheel and axle.
The force used to overcome friction is greater than the force used to do useful work.
32/8 = 4

33. What is the first thing a gear can do?
1
Can change the direction of motion.
To raise a house or other heavy machinery.
Same.

34. Fractional mechanical advantage
Mechanical disadvantage. Use more force than the force of the load you lift.
Same.
A screw and a spur gear.
Equals the weight of the object being hoisted.

35. Formula for fractional mechanical disadvantage.
When a resistance is overcome by a force acting through a measurable distance.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
L=radius of the circle where the handle turns/l=1/2 the width of the edge of the blade = R=force of resistance offered by the screw/E=effort applied by the handle
2(pie)/pitch

36. Friction is involved when?
Two surfaces move against one another.
your arm.
The force used to overcome friction is greater than the force used to do useful work.
Count the number of parts of the rope going to and from the movable block.

37. The bevel gear is used to connect what?
fulcrum- weight- effort
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Shafts lying at any given angle.
Magnify or reduce the force which you apply.

38. What is the second thing a gear can do?
Direction - speed or size of the force applied.
1
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Increase or decrease the the speed of the applied motion.

39. What is the power formula?
To magnify the applied force.
Gravity - Magnetism - Friction - Recoil
Power=Work/Time
Simple machine

40. What kind of machine is the inclined plane?
Wheel and axle.
Simple machine
Connects shafts having a 90 degree angle.
Same.

41. How do you measure power?
Direction - speed or size of the force applied.
Shafts lying at any given angle.
In Horsepower.
Connects shafts having a 90 degree angle.

42. How is distance measured in work?
To raise a house or other heavy machinery.
Magnify or reduce the force which you apply.
To speed up the motion of resistence.
Feet.

43. What direction does the effort and resistance move in the second class levers?
Door knob.
Same.
Mechanical disadvantage. Use more force than the force of the load you lift.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

44. How can you decrease friction on flat surfaces?
Can change the direction of motion.
Find the resistance weight and divide that by the effort you need to lift the weight. M.A=R/E - This rule applies to all machines.
Wheel and axle.
With oil - grease or soap.

45. The miter gear faces are beveled at what angle?
2(pie)/pitch
Work=Force*Distance
45
To speed up the motion of resistence.

46. Class two lever
2(pie)/pitch
Wheel and axle.
Can change the direction of motion.
fulcrum- weight- effort

47. What is the third thing a gear can do?
Magnify or reduce the force which you apply.
The force used to overcome friction is greater than the force used to do useful work.
L=radius of the circle where the handle turns/l=1/2 the width of the edge of the blade = R=force of resistance offered by the screw/E=effort applied by the handle
Work=Force*Distance

48. The threads of a screw are cut so?
Power=Work/Time
The force used to overcome friction is greater than the force used to do useful work.
Same.
Positive mechanical advantage.

49. What direction does the effort and resistance move in third class levers.
Work=Force*Distance
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Same.

50. The worm gear is a combination of what?
fulcrum- weight- effort
A screw and a spur gear.
Gravity - Magnetism - Friction - Recoil
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.