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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 an example of a third class lever?
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
your arm.
Feet.

2. What is another way to find the mechanical advantage of an inclined plane?
Length of ramp/length of height from floor to truck
Third class lever.
Door knob.
A modification of an inclined plane.

3. With a single fixed sheave what is the only mechanical advantage?
To speed up the motion of resistence.
Same.
The change of the direction of the pull.
In Horsepower.

4. The miter gear faces are beveled at what angle?
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.
The change of the direction of the pull.
your arm.

5. What is the mechanical advantage for a single fixed block?
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
1
Positive mechanical advantage.

6. What is the third thing a gear can do?
Can change the direction of motion.
fulcrum- weight- effort
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Magnify or reduce the force which you apply.

7. What is the power formula?
Power=Work/Time
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.
The force used to overcome friction is greater than the force used to do useful work.

8. What is the second thing a gear can do?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
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.
Less than 1.
Increase or decrease the the speed of the applied motion.

9. 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.
Magnify or reduce the force which you apply.
2(pie)/pitch
When a resistance is overcome by a force acting through a measurable distance.

10. What is the formula for the mechanical advantage of a screw?
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.
2(pie)/pitch
With oil - grease or soap.

11. 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.
32/8 = 4
A screw and a spur gear.
In Horsepower.

12. 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.
Simple machine
Gravity - Magnetism - Friction - Recoil

13. What direction does the effort and resistance move in first class levers?
In pounds.
Shafts lying at any given angle.
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.
Opposite.

14. What is the ratio of any gear train?
32/8 = 4
Two surfaces move against one another.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
To magnify the applied force.

15. The bevel gear is used to connect what?
1
Wheel and axle.
The rope that passes through your hands is greater than the distance that the load is raised.
Shafts lying at any given angle.

16. What type of lever provides a fractional mechanical advantage?
Third class lever.
Equals the weight of the object being hoisted.
To raise a house or other heavy machinery.
32/8 = 4

17. Friction is involved when?
Length of ramp/length of height from floor to truck
Two surfaces move against one another.
Power=Work/Time
Gravity - Magnetism - Friction - Recoil

18. Class two lever
Opposite.
1
2(pie)/pitch
fulcrum- weight- effort

19. What kind of machine is the inclined plane?
Simple machine
Feet.
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 screw and a spur gear.

20. Formula for fractional mechanical disadvantage.
With oil - grease or soap.
Opposite.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
45

21. How is force measured in work?
32/8 = 4
Feet.
In pounds.
Opposite.

22. What does a micrometer measure?
In pounds.
A few thousandths of an inch.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
A screw and a spur gear.

23. How is work done?
Wheel and axle.
Gravity - Magnetism - Friction - Recoil
When a resistance is overcome by a force acting through a measurable distance.
Increase or decrease the the speed of the applied motion.

24. 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.
Magnify or reduce the force which you apply.
Positive mechanical advantage.
Direction - speed or size of the force applied.

25. What are first and third class levers used for?
The change of the direction of the pull.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
To speed up the motion of resistence.
To magnify the applied force.

26. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Equals the weight of the object being hoisted.
Count the number of parts of the rope going to and from the movable block.
Feet.
45

27. What is the first thing a gear can do?
fulcrum- weight- effort
Same.
Can change the direction of motion.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

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

29. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
The rope that passes through your hands is greater than the distance that the load is raised.
fulcrum- weight- effort
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

30. What is the work formula?
Two surfaces move against one another.
Work=Force*Distance
Third class lever.
The change of the direction of the pull.

31. What is another example of a wheel and axle?
To magnify the applied force.
A few thousandths of an inch.
Door knob.
fulcrum- weight- effort

32. How is distance measured in work?
Power=Work/Time
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Feet.
Same.

33. An egg beater has a mechanical advantage of what?
fulcrum- weight- effort
your arm.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Less than 1.

34. A miter gear connects what?
Opposite.
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
Connects shafts having a 90 degree angle.

35. What is the lever formula?
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
Count the number of parts of the rope going to and from the movable block.
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.

36. What is the theoretical mechanical advantage of any gear train?
Less than 1.
Magnify or reduce the force which you apply.
Equals the weight of the object being hoisted.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

37. What direction does the effort and resistance move in third class levers.
Foot- pounds
Same.
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

38. Work is measured in units also known as?
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.
A screw and a spur gear.
Same.

39. hat is a screw?
fulcrum- weight- effort
Direction - speed or size of the force applied.
A modification of an inclined plane.
The force used to overcome friction is greater than the force used to do useful work.

40. What is one type of second class lever?
Wheel and axle.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
A modification of an inclined plane.
1

41. What are the 4 forces?
To magnify the applied force.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Gravity - Magnetism - Friction - Recoil
Two surfaces move against one another.

42. 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.
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.
Same.

43. What kind of mechanical advantage does the first and second class lever provide?
The change of the direction of the pull.
To raise a house or other heavy machinery.
Positive mechanical advantage.
45

44. The worm gear is a combination 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.
Positive mechanical advantage.
A screw and a spur gear.
Gravity - Magnetism - Friction - Recoil

45. How can you decrease friction on flat surfaces?
To magnify the applied force.
With oil - grease or soap.
Can change the direction of motion.
A modification of an inclined plane.

46. How do you measure power?
Equals the weight of the object being hoisted.
Less than 1.
Connects shafts having a 90 degree angle.
In Horsepower.

47. What direction does the effort and resistance move in the second class levers?
Length of ramp/length of height from floor to truck
2(pie)/pitch
Same.
fulcrum- weight- effort

48. How do you find the mechanical advantage?
Wheel and axle.
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.
Connects shafts having a 90 degree angle.

49. What is the formula for the wheel and axle?
Foot- pounds
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
Shafts lying at any given angle.

50. What is the mechanical advantage of a single movable block?
In Horsepower.
Work=Force*Distance
2. Each half of the rope carries an equal amount of weight.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

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