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Mechanical Systems 3

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Answer 50 questions in 15 minutes.
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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. Class two lever
fulcrum- weight- effort
Same.
A screw and a spur gear.
When a resistance is overcome by a force acting through a measurable distance.

2. How is force measured in work?
In pounds.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Feet.
The force used to overcome friction is greater than the force used to do useful work.

3. With a single fixed sheave what is the only mechanical advantage?
To speed up the motion of resistence.
The change of the direction of the pull.
To raise a house or other heavy machinery.
A modification of an inclined plane.

4. What is the third thing a gear can do?
Simple machine
Magnify or reduce the force which you apply.
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.

5. What is the power formula?
Increase or decrease the the speed of the applied motion.
Power=Work/Time
45
1

6. What direction does the effort and resistance move in first class levers?
Shafts lying at any given angle.
Count the number of parts of the rope going to and from the movable block.
Connects shafts having a 90 degree angle.
Opposite.

7. The miter gear faces are beveled at what angle?
Less than 1.
Same.
Same.
45

8. What is the mechanical advantage for a single fixed block?
1
Same.
To raise a house or other heavy machinery.
Mechanical disadvantage. Use more force than the force of the load you lift.

9. What is the jack screw used for?
To raise a house or other heavy machinery.
A modification of an inclined plane.
Equals the weight of the object being hoisted.
Mechanical disadvantage. Use more force than the force of the load you lift.

10. Gears can do a job for you by changing what three things?
Same.
In Horsepower.
Direction - speed or size of the force applied.
A modification of an inclined plane.

11. What kind of mechanical advantage does the first and second class lever provide?
When a resistance is overcome by a force acting through a measurable distance.
Positive mechanical advantage.
A screw and a spur gear.
A few thousandths of an inch.

12. What is the purpose of a third class lever?
To speed up the motion of resistence.
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
your arm.
Same.

13. What is the formula for the mechanical advantage of a screw?
Direction - speed or size of the force applied.
Connects shafts having a 90 degree angle.
Count the number of parts of the rope going to and from the movable block.
2(pie)/pitch

14. What is the second thing a gear can do?
32/8 = 4
Third class lever.
Increase or decrease the the speed of the applied motion.
Power=Work/Time

15. How can you figure out the mechanical advantage of most block and falls by glance?
Count the number of parts of the rope going to and from the movable block.
Two surfaces move against one another.
Mechanical disadvantage. Use more force than the force of the load you lift.
Feet.

16. What is the formula for the wheel and axle?
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
Count the number of parts of the rope going to and from the movable block.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

17. What type of lever provides a fractional mechanical advantage?
Simple machine
A few thousandths of an inch.
32/8 = 4
Third class lever.

18. How do you find the mechanical advantage?
Less than 1.
1
Direction - speed or size of the force applied.
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.

19. What is the ratio of any gear train?
Third class lever.
A screw and a spur gear.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
45

20. What kind of machine is the inclined plane?
Simple machine
2(pie)/pitch
Third class lever.
When a resistance is overcome by a force acting through a measurable distance.

21. What direction does the effort and resistance move in the second class levers?
Same.
Door knob.
Positive mechanical advantage.
Opposite.

22. Formula for fractional mechanical disadvantage.
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.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Work=Force*Distance
Positive mechanical advantage.

23. What is the first thing a gear can do?
Same.
Feet.
fulcrum- weight- effort
Can change the direction of motion.

24. An egg beater has a mechanical advantage of what?
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
Same.
Less than 1.
A few thousandths of an inch.

25. What is another way to find the mechanical advantage of an inclined plane?
Simple machine
To raise a house or other heavy machinery.
Length of ramp/length of height from floor to truck
fulcrum- weight- effort

26. hat is a screw?
To raise a house or other heavy machinery.
Wheel and axle.
Connects shafts having a 90 degree angle.
A modification of an inclined plane.

27. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Foot- pounds
Equals the weight of the object being hoisted.
Wheel and axle.
The rope that passes through your hands is greater than the distance that the load is raised.

28. Work is measured in units also known as?
Foot- pounds
In Horsepower.
In pounds.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

29. What direction does the effort and resistance move in third class levers.
Opposite.
Equals the weight of the object being hoisted.
2(pie)/pitch
Same.

30. How do you measure power?
Connects shafts having a 90 degree angle.
Magnify or reduce the force which you apply.
Equals the weight of the object being hoisted.
In Horsepower.

31. What does a micrometer measure?
To magnify the applied force.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
A few thousandths of an inch.
Gravity - Magnetism - Friction - Recoil

32. The threads of a screw are cut so?
With oil - grease or soap.
The force used to overcome friction is greater than the force used to do useful work.
Length of ramp/length of height from floor to truck
To speed up the motion of resistence.

33. What is another example of a wheel and axle?
2(pie)/pitch
The change of the direction of the pull.
Simple machine
Door knob.

34. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
Foot- pounds
In Horsepower.
The rope that passes through your hands is greater than the distance that the load is raised.
45

35. 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?
32/8 = 4
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
In pounds.
When a resistance is overcome by a force acting through a measurable distance.

36. How is work done?
Shafts lying at any given angle.
When a resistance is overcome by a force acting through a measurable distance.
45
your arm.

37. What is an example of a third class lever?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
The force used to overcome friction is greater than the force used to do useful work.
your arm.
A few thousandths of an inch.

38. Fractional mechanical advantage
Simple machine
Opposite.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Mechanical disadvantage. Use more force than the force of the load you lift.

39. What is one type of second class lever?
Connects shafts having a 90 degree angle.
Wheel and axle.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
your arm.

40. The bevel gear is used to connect what?
Shafts lying at any given angle.
A screw and a spur gear.
Same.
1

41. What are the 4 forces?
Third class lever.
Gravity - Magnetism - Friction - Recoil
Length of ramp/length of height from floor to truck
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

42. What is the work formula?
Work=Force*Distance
A modification of an inclined plane.
Direction - speed or size of the force applied.
To raise a house or other heavy machinery.

43. What are first and third class levers used for?
With oil - grease or soap.
The force used to overcome friction is greater than the force used to do useful work.
Same.
To magnify the applied force.

44. A miter gear connects what?
Two surfaces move against one another.
Count the number of parts of the rope going to and from the movable block.
Connects shafts having a 90 degree angle.
Opposite.

45. The worm gear is a combination of what?
A screw and a spur gear.
Power=Work/Time
The change of the direction of the pull.
1

46. What is the lever formula?
The rope that passes through your hands is greater than the distance that the load is raised.
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
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
2. Each half of the rope carries an equal amount of weight.

47. How is distance measured in work?
The force used to overcome friction is greater than the force used to do useful work.
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.
Feet.
With oil - grease or soap.

48. What is the theoretical mechanical advantage of any gear train?
To raise a house or other heavy machinery.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Wheel and axle.
The force used to overcome friction is greater than the force used to do useful work.

49. How can you decrease friction on flat surfaces?
With oil - grease or soap.
Length of ramp/length of height from floor to truck
A few thousandths of an inch.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

50. Friction is involved when?
The change of the direction of the pull.
Magnify or reduce the force which you apply.
Two surfaces move against one another.
Shafts lying at any given angle.

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Mechanical Systems 3

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