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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. An egg beater has a mechanical advantage of what?
Less than 1.
Opposite.
A modification of an inclined plane.
Simple machine

2. What is the mechanical advantage of a single movable block?
Wheel and axle.
2. Each half of the rope carries an equal amount of weight.
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
The force used to overcome friction is greater than the force used to do useful work.

3. What is the first thing a gear can do?
Less than 1.
When a resistance is overcome by a force acting through a measurable distance.
Can change the direction of motion.
Third class lever.

4. How is force measured in work?
fulcrum- weight- effort
The rope that passes through your hands is greater than the distance that the load is raised.
Third class lever.
In pounds.

5. What does a micrometer measure?
1
A few thousandths of an inch.
Length of ramp/length of height from floor to truck
Connects shafts having a 90 degree angle.

6. With a single fixed sheave what is the only mechanical advantage?
The change of the direction of the pull.
A few thousandths of an inch.
2. Each half of the rope carries an equal amount of weight.
your arm.

7. Formula for fractional mechanical disadvantage.
Third class lever.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Connects shafts having a 90 degree angle.
Positive mechanical advantage.

8. What is the theoretical mechanical advantage of any gear train?
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
your arm.
The force used to overcome friction is greater than the force used to do useful work.

9. What type of lever provides a fractional mechanical advantage?
Third class lever.
The rope that passes through your hands is greater than the distance that the load is raised.
Count the number of parts of the rope going to and from the movable block.
In Horsepower.

10. What is the mechanical advantage for a single fixed block?
Magnify or reduce the force which you apply.
Third class lever.
1
Increase or decrease the the speed of the applied motion.

11. What direction does the effort and resistance move in third class levers.
Work=Force*Distance
Feet.
Same.
2(pie)/pitch

12. What is the purpose of a third class lever?
Count the number of parts of the rope going to and from the movable block.
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
Mechanical disadvantage. Use more force than the force of the load you lift.

13. What are the 4 forces?
Simple machine
Two surfaces move against one another.
Gravity - Magnetism - Friction - Recoil
45

14. What is the lever formula?
A screw and a spur gear.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Less than 1.
Two surfaces move against one another.

15. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
Foot- pounds
With oil - grease or soap.
Magnify or reduce the force which you apply.
The rope that passes through your hands is greater than the distance that the load is raised.

16. What is the formula for the mechanical advantage of a screw?
To magnify the applied force.
Gravity - Magnetism - Friction - Recoil
2(pie)/pitch
Foot- pounds

17. How is work done?
A screw and a spur gear.
your arm.
When a resistance is overcome by a force acting through a measurable distance.
In pounds.

18. 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
Two surfaces move against one another.
Mechanical disadvantage. Use more force than the force of the load you lift.
Feet.

19. What is another way to find the mechanical advantage of an inclined plane?
In Horsepower.
Length of ramp/length of height from floor to truck
To raise a house or other heavy machinery.
Equals the weight of the object being hoisted.

20. What is the third thing a gear can do?
Positive mechanical advantage.
Connects shafts having a 90 degree angle.
Magnify or reduce the force which you apply.
2. Each half of the rope carries an equal amount of weight.

21. What is the formula for the wheel and axle?
Gravity - Magnetism - Friction - Recoil
Count the number of parts of the rope going to and from the movable block.
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
Door knob.

22. Class two lever
fulcrum- weight- effort
Length of ramp/length of height from floor to truck
A screw and a spur gear.
45

23. The threads of a screw are cut so?
Opposite.
The change of the direction of the pull.
The force used to overcome friction is greater than the force used to do useful work.
Power=Work/Time

24. Fractional mechanical advantage
To raise a house or other heavy machinery.
Mechanical disadvantage. Use more force than the force of the load you lift.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
A screw and a spur gear.

25. 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?
Feet.
Same.
Door knob.
32/8 = 4

26. What is the second thing a gear can do?
Length of ramp/length of height from floor to truck
Count the number of parts of the rope going to and from the movable block.
Wheel and axle.
Increase or decrease the the speed of the applied motion.

27. What kind of machine is the inclined plane?
Length of ramp/length of height from floor to truck
Feet.
To magnify the applied force.
Simple machine

28. A miter gear connects what?
Connects shafts having a 90 degree angle.
Shafts lying at any given angle.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Length of ramp/length of height from floor to truck

29. What is an example of a third class lever?
The force used to overcome friction is greater than the force used to do useful work.
your arm.
Can change the direction of motion.
Length of ramp/length of height from floor to truck

30. Gears can do a job for you by changing what three things?
The force used to overcome friction is greater than the force used to do useful work.
Direction - speed or size of the force applied.
Count the number of parts of the rope going to and from the movable block.
Opposite.

31. What direction does the effort and resistance move in first class levers?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Two surfaces move against one another.
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
Opposite.

32. What direction does the effort and resistance move in the second class levers?
Positive mechanical advantage.
Same.
A screw and a spur gear.
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.

33. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
In pounds.
Equals the weight of the object being hoisted.
Count the number of parts of the rope going to and from the movable block.

34. How is distance measured in work?
2(pie)/pitch
Feet.
A modification of an inclined plane.
Length of ramp/length of height from floor to truck

35. How can you figure out the mechanical advantage of most block and falls by glance?
When a resistance is overcome by a force acting through a measurable distance.
2. Each half of the rope carries an equal amount of weight.
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.

36. hat is a screw?
Wheel and axle.
In pounds.
A modification of an inclined plane.
Door knob.

37. 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.
1
In Horsepower.
Equals the weight of the object being hoisted.

38. What kind of mechanical advantage does the first and second class lever provide?
Positive mechanical advantage.
Mechanical disadvantage. Use more force than the force of the load you lift.
2(pie)/pitch
A screw and a spur gear.

39. The miter gear faces are beveled at what angle?
Opposite.
45
Length of ramp/length of height from floor to truck
Equals the weight of the object being hoisted.

40. What is the jack screw used for?
A modification of an inclined plane.
Two surfaces move against one another.
Simple machine
To raise a house or other heavy machinery.

41. The bevel gear is used to connect what?
Shafts lying at any given angle.
Length of ramp/length of height from floor to truck
To magnify the applied force.
fulcrum- weight- effort

42. Work is measured in units also known as?
your arm.
Positive mechanical advantage.
Foot- pounds
Opposite.

43. The worm gear is a combination of what?
When a resistance is overcome by a force acting through a measurable distance.
A screw and a spur gear.
Feet.
Equals the weight of the object being hoisted.

44. What is the power formula?
Power=Work/Time
A screw and a spur gear.
Less than 1.
Foot- pounds

45. What are first and third class levers used for?
To magnify the applied force.
Feet.
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
The change of the direction of the pull.

46. How do you measure power?
When a resistance is overcome by a force acting through a measurable distance.
The force used to overcome friction is greater than the force used to do useful work.
In Horsepower.
1

47. What is the ratio of any gear train?
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.
Gravity - Magnetism - Friction - Recoil
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

48. What is the work formula?
To raise a house or other heavy machinery.
Magnify or reduce the force which you apply.
Simple machine
Work=Force*Distance

49. What is another example of a wheel and axle?
A screw and a spur gear.
Door knob.
The force used to overcome friction is greater than the force used to do useful work.
Wheel and axle.

50. How can you decrease friction on flat surfaces?
With oil - grease or soap.
Power=Work/Time
Increase or decrease the the speed of the applied motion.
Length of ramp/length of height from floor to truck