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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 ratio of any gear train?
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.
Less than 1.
Length of ramp/length of height from floor to truck

2. Work is measured in units also known as?
To magnify the applied force.
Foot- pounds
Opposite.
To raise a house or other heavy machinery.

3. The worm gear is a combination of what?
To raise a house or other heavy machinery.
Count the number of parts of the rope going to and from the movable block.
Equals the weight of the object being hoisted.
A screw and a spur gear.

4. What kind of machine is the inclined plane?
32/8 = 4
Positive mechanical advantage.
Simple machine
In Horsepower.

5. What is another example of a wheel and axle?
Door knob.
Foot- pounds
2(pie)/pitch
Connects shafts having a 90 degree angle.

6. Formula for fractional mechanical disadvantage.
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.
Simple machine
1

7. What direction does the effort and resistance move in third class levers.
Length of ramp/length of height from floor to truck
Same.
Increase or decrease the the speed of the applied motion.
Positive mechanical advantage.

8. What type of lever provides a fractional mechanical advantage?
Can change the direction of motion.
To speed up the motion of resistence.
Third class lever.
32/8 = 4

9. How is work done?
When a resistance is overcome by a force acting through a measurable distance.
Power=Work/Time
Equals the weight of the object being hoisted.
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

10. What is the purpose of a third class lever?
Wheel and axle.
Length of ramp/length of height from floor to truck
To speed up the motion of resistence.
Less than 1.

11. What are the 4 forces?
The force used to overcome friction is greater than the force used to do useful work.
Can change the direction of motion.
In Horsepower.
Gravity - Magnetism - Friction - Recoil

12. What is the mechanical advantage for a single fixed block?
A modification of an inclined plane.
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
1
Mechanical disadvantage. Use more force than the force of the load you lift.

13. What is the mechanical advantage of a single movable block?
2. Each half of the rope carries an equal amount of weight.
Gravity - Magnetism - Friction - Recoil
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Equals the weight of the object being hoisted.

14. What is the lever formula?
Can change the direction of motion.
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.
To speed up the motion of resistence.

15. What is the formula for the mechanical advantage of a screw?
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
To raise a house or other heavy machinery.
Foot- pounds
2(pie)/pitch

16. A miter gear connects what?
1
In pounds.
45
Connects shafts having a 90 degree angle.

17. What is the first thing a gear can do?
fulcrum- weight- effort
Can change the direction of motion.
Same.
32/8 = 4

18. What does a micrometer measure?
Magnify or reduce the force which you apply.
A few thousandths of an inch.
The change of the direction of the pull.
Can change the direction of motion.

19. An egg beater has a mechanical advantage of what?
Less than 1.
45
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Same.

20. 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?
Same.
32/8 = 4
In Horsepower.
fulcrum- weight- effort

21. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
The rope that passes through your hands is greater than the distance that the load is raised.
Magnify or reduce the force which you apply.
A modification of an inclined plane.
Can change the direction of motion.

22. Friction is involved when?
The rope that passes through your hands is greater than the distance that the load is raised.
Two surfaces move against one another.
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.

23. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Same.
Power=Work/Time
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.

24. The threads of a screw are cut so?
Foot- pounds
Shafts lying at any given angle.
Same.
The force used to overcome friction is greater than the force used to do useful work.

25. What kind of mechanical advantage does the first and second class lever provide?
Positive mechanical advantage.
To magnify the applied force.
Less than 1.
45

26. What is the work formula?
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Same.
To raise a house or other heavy machinery.
Work=Force*Distance

27. The bevel gear is used to connect what?
Mechanical disadvantage. Use more force than the force of the load you lift.
To speed up the motion of resistence.
When a resistance is overcome by a force acting through a measurable distance.
Shafts lying at any given angle.

28. Gears can do a job for you by changing what three things?
Direction - speed or size of the force applied.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Opposite.
1

29. What is the third thing a gear can do?
Magnify or reduce the force which you apply.
Two surfaces move against one another.
Feet.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

30. How is distance measured in work?
A modification of an inclined plane.
Shafts lying at any given angle.
When a resistance is overcome by a force acting through a measurable distance.
Feet.

31. How do you find the mechanical advantage?
Direction - speed or size of the force applied.
To raise a house or other heavy machinery.
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.
Wheel and axle.

32. hat is a screw?
Less than 1.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
A modification of an inclined plane.
Foot- pounds

33. What direction does the effort and resistance move in first class levers?
Increase or decrease the the speed of the applied motion.
Magnify or reduce the force which you apply.
Opposite.
Can change the direction of motion.

34. How can you figure out the mechanical advantage of most block and falls by glance?
Work=Force*Distance
Count the number of parts of the rope going to and from the movable block.
Magnify or reduce the force which you apply.
45

35. What is the second thing a gear can do?
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.
Increase or decrease the the speed of the applied motion.
32/8 = 4

36. What are first and third class levers used for?
Count the number of parts of the rope going to and from the movable block.
Magnify or reduce the force which you apply.
To magnify the applied force.
With oil - grease or soap.

37. What is one type of second class lever?
Equals the weight of the object being hoisted.
Power=Work/Time
Wheel and axle.
The change of the direction of the pull.

38. What is an example of a third class lever?
your arm.
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.
Increase or decrease the the speed of the applied motion.

39. What direction does the effort and resistance move in the second class levers?
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.
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
45

40. 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
fulcrum- weight- effort
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven 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.

41. What is the jack screw used for?
To magnify the applied force.
Positive mechanical advantage.
Wheel and axle.
To raise a house or other heavy machinery.

42. Fractional mechanical advantage
Mechanical disadvantage. Use more force than the force of the load you lift.
In Horsepower.
To raise a house or other heavy machinery.
Magnify or reduce the force which you apply.

43. How do you measure power?
In Horsepower.
Same.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
A few thousandths of an inch.

44. What is the theoretical mechanical advantage of any gear train?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
In pounds.
Gravity - Magnetism - Friction - Recoil
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

45. What is another way to find the mechanical advantage of an inclined plane?
Length of ramp/length of height from floor to truck
45
Same.
The force used to overcome friction is greater than the force used to do useful work.

46. How can you decrease friction on flat surfaces?
Wheel and axle.
The rope that passes through your hands is greater than the distance that the load is raised.
With oil - grease or soap.
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.

47. With a single fixed sheave what is the only mechanical advantage?
Two surfaces move against one another.
Can change the direction of motion.
The change of the direction of the pull.
Positive mechanical advantage.

48. The miter gear faces are beveled at what angle?
32/8 = 4
Count the number of parts of the rope going to and from the movable block.
45
2(pie)/pitch

49. What is the power formula?
Power=Work/Time
A few thousandths of an inch.
Same.
In pounds.

50. How is force measured in work?
In Horsepower.
Count the number of parts of the rope going to and from the movable block.
In pounds.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.