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Mechanical Systems 3

Instructions:

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 purpose of a third class lever?
When a resistance is overcome by a force acting through a measurable distance.
The change of the direction of the pull.
To speed up the motion of resistence.
With oil - grease or soap.

2. What is another example of a wheel and axle?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Door knob.
In pounds.
2. Each half of the rope carries an equal amount of weight.

3. What is the mechanical advantage for a single fixed block?
Length of ramp/length of height from floor to truck
With oil - grease or soap.
Gravity - Magnetism - Friction - Recoil
1

4. With a single fixed sheave what is the only mechanical advantage?
The change of the direction of the pull.
The rope that passes through your hands is greater than the distance that the load is raised.
Work=Force*Distance
Gravity - Magnetism - Friction - Recoil

5. Work is measured in units also known as?
Foot- pounds
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
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
fulcrum- weight- effort

6. What is the ratio of any gear train?
2(pie)/pitch
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.
Foot- pounds
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

7. What is the lever formula?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Same.
Direction - speed or size of the force applied.
Length of ramp/length of height from floor to truck

8. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
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
Two surfaces move against one another.
Equals the weight of the object being hoisted.
Wheel and axle.

9. hat is a screw?
Work=Force*Distance
Shafts lying at any given angle.
Magnify or reduce the force which you apply.
A modification of an inclined plane.

10. An egg beater has a mechanical advantage of what?
1
With oil - grease or soap.
Connects shafts having a 90 degree angle.
Less than 1.

11. Gears can do a job for you by changing what three things?
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.
Shafts lying at any given angle.
A screw and a spur gear.
Direction - speed or size of the force applied.

12. What type of lever provides a fractional mechanical advantage?
Connects shafts having a 90 degree angle.
In Horsepower.
Third class lever.
Count the number of parts of the rope going to and from the movable block.

13. What kind of machine is the inclined plane?
Simple machine
Opposite.
A few thousandths of an inch.
Two surfaces move against one another.

14. What is the jack screw used for?
Work=Force*Distance
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.
To raise a house or other heavy machinery.

15. What is the theoretical mechanical advantage of any gear train?
Door knob.
With oil - grease or soap.
Shafts lying at any given angle.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

16. The worm gear is a combination of what?
Feet.
A screw and a spur gear.
In Horsepower.
Opposite.

17. How do you find the mechanical advantage?
Simple machine
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.
To magnify the applied force.
Count the number of parts of the rope going to and from the movable block.

18. What direction does the effort and resistance move in first class levers?
Simple machine
Same.
45
Opposite.

19. How do you measure power?
To raise a house or other heavy machinery.
Direction - speed or size of the force applied.
Gravity - Magnetism - Friction - Recoil
In Horsepower.

20. Class two lever
your arm.
fulcrum- weight- effort
Work=Force*Distance
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.

21. What is the first thing a gear can do?
Mechanical disadvantage. Use more force than the force of the load you lift.
Can change the direction of motion.
In Horsepower.
Same.

22. What is the power formula?
Mechanical disadvantage. Use more force than the force of the load you lift.
Opposite.
A modification of an inclined plane.
Power=Work/Time

23. How is force measured in work?
A modification of an inclined plane.
2. Each half of the rope carries an equal amount of weight.
In pounds.
Can change the direction of motion.

24. What direction does the effort and resistance move in third class levers.
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.
Shafts lying at any given angle.
Same.
In Horsepower.

25. What is the third thing a gear can do?
In pounds.
Magnify or reduce the force which you apply.
Same.
A few thousandths of an inch.

26. Formula for fractional mechanical disadvantage.
Length of ramp/length of height from floor to truck
To raise a house or other heavy machinery.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
1

27. What is the mechanical advantage of a single movable block?
To magnify the applied force.
2. Each half of the rope carries an equal amount of weight.
Simple machine
Length of ramp/length of height from floor to truck

28. The bevel gear is used to connect what?
The rope that passes through your hands is greater than the distance that the load is raised.
Shafts lying at any given angle.
The change of the direction of the pull.
Work=Force*Distance

29. What direction does the effort and resistance move in the second class levers?
Same.
A few thousandths of an inch.
The change of the direction of the pull.
your arm.

30. 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
Equals the weight of the object being hoisted.
With oil - grease or soap.
Count the number of parts of the rope going to and from the movable block.

31. Fractional mechanical advantage
Length of ramp/length of height from floor to truck
Mechanical disadvantage. Use more force than the force of the load you lift.
Simple machine
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

32. What is the work formula?
Work=Force*Distance
Positive mechanical advantage.
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.

33. What is an example of a third class lever?
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.
your arm.
Same.

34. What is one type of second class lever?
Wheel and axle.
With oil - grease or soap.
A modification of an inclined plane.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

35. How is distance measured in work?
Feet.
Can change the direction of motion.
Same.
32/8 = 4

36. What are the 4 forces?
Simple machine
Shafts lying at any given angle.
Magnify or reduce the force which you apply.
Gravity - Magnetism - Friction - Recoil

37. What is another way to find the mechanical advantage of an inclined plane?
Opposite.
Length of ramp/length of height from floor to truck
Third class lever.
Mechanical disadvantage. Use more force than the force of the load you lift.

38. The threads of a screw are cut so?
With oil - grease or soap.
Two surfaces move against one another.
Work=Force*Distance
The force used to overcome friction is greater than the force used to do useful work.

39. How can you figure out the mechanical advantage of most block and falls by glance?
2. Each half of the rope carries an equal amount of weight.
1
Count the number of parts of the rope going to and from the movable block.
Less than 1.

40. What is the formula for the mechanical advantage of a screw?
Count the number of parts of the rope going to and from the movable block.
2(pie)/pitch
Same.
2. Each half of the rope carries an equal amount of weight.

41. What is the formula for the wheel and axle?
In Horsepower.
Length of ramp/length of height from floor to truck
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.
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

42. The miter gear faces are beveled at what angle?
Length of ramp/length of height from floor to truck
45
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
fulcrum- weight- effort

43. How can you decrease friction on flat surfaces?
To raise a house or other heavy machinery.
Increase or decrease the the speed of the applied motion.
With oil - grease or soap.
32/8 = 4

44. What does a micrometer measure?
A few thousandths of an inch.
Can change the direction of motion.
45
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. What are first and third class levers used for?
Direction - speed or size of the force applied.
Wheel and axle.
To magnify the applied force.
Door knob.

46. A miter gear connects what?
A few thousandths of an inch.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Direction - speed or size of the force applied.
Connects shafts having a 90 degree angle.

47. How is work done?
A few thousandths of an inch.
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
Feet.
When a resistance is overcome by a force acting through a measurable distance.

48. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
To speed up the motion of resistence.
Work=Force*Distance
your arm.
The rope that passes through your hands is greater than the distance that the load is raised.

49. What kind of mechanical advantage does the first and second class lever provide?
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
With oil - grease or soap.
Positive mechanical advantage.
Gravity - Magnetism - Friction - Recoil

50. Friction is involved when?
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
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Shafts lying at any given angle.
Two surfaces move against one another.