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Mechanical Systems 3

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Answer 50 questions in 15 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 third thing a gear can do?
Direction - speed or size of the force applied.
Positive mechanical advantage.
Magnify or reduce the force which you apply.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

2. What is the jack screw used for?
To raise a house or other heavy machinery.
Mechanical disadvantage. Use more force than the force of the load you lift.
In Horsepower.
A modification of an inclined plane.

3. How is force measured in work?
Power=Work/Time
In pounds.
To raise a house or other heavy machinery.
Length of ramp/length of height from floor to truck

4. The bevel gear is used to connect what?
Wheel and axle.
Shafts lying at any given angle.
The rope that passes through your hands is greater than the distance that the load is raised.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

5. What is the formula for the wheel and axle?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
32/8 = 4
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
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.

6. What direction does the effort and resistance move in the second class levers?
In Horsepower.
Work=Force*Distance
Same.
2(pie)/pitch

7. Formula for fractional mechanical disadvantage.
32/8 = 4
fulcrum- weight- effort
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Count the number of parts of the rope going to and from the movable block.

8. Gears can do a job for you by changing what three things?
Mechanical disadvantage. Use more force than the force of the load you lift.
Direction - speed or size of the force applied.
Feet.
Connects shafts having a 90 degree angle.

9. What type of lever provides a fractional mechanical advantage?
Less than 1.
Third class lever.
When a resistance is overcome by a force acting through a measurable distance.
Length of ramp/length of height from floor to truck

10. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Magnify or reduce the force which you apply.
Work=Force*Distance
Equals the weight of the object being hoisted.
In pounds.

11. An egg beater has a mechanical advantage of what?
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.
Less than 1.
To raise a house or other heavy machinery.

12. How is work done?
To magnify the applied force.
When a resistance is overcome by a force acting through a measurable distance.
Positive mechanical advantage.
Wheel and axle.

13. What kind of mechanical advantage does the first and second class lever provide?
Positive mechanical advantage.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Door knob.
To raise a house or other heavy machinery.

14. What is the ratio of any gear train?
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
2(pie)/pitch
Door knob.
The rope that passes through your hands is greater than the distance that the load is raised.

15. What are first and third class levers used for?
Count the number of parts of the rope going to and from the movable block.
A few thousandths of an inch.
To magnify the applied force.
The force used to overcome friction is greater than the force used to do useful work.

16. What direction does the effort and resistance move in first class levers?
2. Each half of the rope carries an equal amount of weight.
Third class lever.
Opposite.
your arm.

17. How do you measure power?
In Horsepower.
Opposite.
Simple machine
2(pie)/pitch

18. The miter gear faces are beveled at what angle?
Opposite.
45
Wheel and axle.
Shafts lying at any given angle.

19. What is the purpose of a third class lever?
To speed up the motion of resistence.
A few thousandths of an inch.
Shafts lying at any given angle.
Door knob.

20. What is the power formula?
Door knob.
your arm.
Power=Work/Time
Magnify or reduce the force which you apply.

21. How can you decrease friction on flat surfaces?
With oil - grease or soap.
A screw and a spur gear.
Increase or decrease the the speed of the applied motion.
Work=Force*Distance

22. What is the mechanical advantage for a single fixed block?
1
Same.
The change of the direction of the pull.
Mechanical disadvantage. Use more force than the force of the load you lift.

23. The worm gear is a combination of what?
To raise a house or other heavy machinery.
A screw and a spur gear.
The force used to overcome friction is greater than the force used to do useful work.
2. Each half of the rope carries an equal amount of weight.

24. What is the mechanical advantage of a single movable block?
Equals the weight of the object being hoisted.
2. Each half of the rope carries an equal amount of weight.
Feet.
Work=Force*Distance

25. What is one type of second class lever?
2. Each half of the rope carries an equal amount of weight.
Wheel and axle.
A modification of an inclined plane.
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.

26. What is the work formula?
Work=Force*Distance
To speed up the motion of resistence.
Third class lever.
A few thousandths of an inch.

27. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
Feet.
When a resistance is overcome by a force acting through a measurable distance.
The rope that passes through your hands is greater than the distance that the load is raised.
Equals the weight of the object being hoisted.

28. What is the second thing a gear can do?
Positive mechanical advantage.
Equals the weight of the object being hoisted.
your arm.
Increase or decrease the the speed of the applied motion.

29. hat is a screw?
A modification of an inclined plane.
Mechanical disadvantage. Use more force than the force of the load you lift.
Foot- pounds
1

30. What is the formula for the mechanical advantage of a screw?
Work=Force*Distance
Same.
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.
2(pie)/pitch

31. Friction is involved when?
Two surfaces move against one another.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Positive mechanical advantage.
Feet.

32. What does a micrometer measure?
Magnify or reduce the force which you apply.
A few thousandths of an inch.
Work=Force*Distance
Connects shafts having a 90 degree angle.

33. How is distance measured in work?
A modification of an inclined plane.
Simple machine
Feet.
To magnify the applied force.

34. What direction does the effort and resistance move in third class levers.
To raise a house or other heavy machinery.
Opposite.
Same.
Magnify or reduce the force which you apply.

35. Work is measured in units also known as?
With oil - grease or soap.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Mechanical disadvantage. Use more force than the force of the load you lift.
Foot- pounds

36. What is an example of a third class lever?
A few thousandths of an inch.
1
your arm.
In Horsepower.

37. What is the lever formula?
1
Less than 1.
Power=Work/Time
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

38. 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?
A screw and a spur gear.
32/8 = 4
1
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

39. A miter gear connects what?
Shafts lying at any given angle.
Two surfaces move against one another.
Connects shafts having a 90 degree angle.
Gravity - Magnetism - Friction - Recoil

40. With a single fixed sheave what is the only mechanical advantage?
45
The change of the direction of the pull.
To raise a house or other heavy machinery.
In Horsepower.

41. How do you find the mechanical advantage?
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.
A modification of an inclined plane.
Foot- pounds

42. The threads of a screw are cut so?
The force used to overcome friction is greater than the force used to do useful work.
Positive mechanical advantage.
The rope that passes through your hands is greater than the distance that the load is raised.
To raise a house or other heavy machinery.

43. How can you figure out the mechanical advantage of most block and falls by glance?
2(pie)/pitch
Count the number of parts of the rope going to and from the movable block.
Shafts lying at any given angle.
When a resistance is overcome by a force acting through a measurable distance.

44. What kind of machine is the inclined plane?
The rope that passes through your hands is greater than the distance that the load is raised.
Feet.
your arm.
Simple machine

45. What is the first thing a gear can do?
The force used to overcome friction is greater than the force used to do useful work.
Can change the direction of motion.
Same.
Two surfaces move against one another.

46. What is another way to find the mechanical advantage of an inclined plane?
Length of ramp/length of height from floor to truck
With oil - grease or soap.
1
Third class lever.

47. What are the 4 forces?
Gravity - Magnetism - Friction - Recoil
To speed up the motion of resistence.
45
Direction - speed or size of the force applied.

48. Class two lever
The rope that passes through your hands is greater than the distance that the load is raised.
Third class lever.
fulcrum- weight- effort
Foot- pounds

49. What is another example of a wheel and axle?
45
Door knob.
In Horsepower.
Positive mechanical advantage.

50. Fractional mechanical advantage
Mechanical disadvantage. Use more force than the force of the load you lift.
Can change the direction of motion.
2(pie)/pitch
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

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Mechanical Systems 3

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