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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. The bevel gear is used to connect what?
32/8 = 4
2. Each half of the rope carries an equal amount of weight.
Shafts lying at any given angle.
Simple machine

2. How can you decrease friction on flat surfaces?
Less than 1.
With oil - grease or soap.
Positive mechanical advantage.
Shafts lying at any given angle.

3. What is the work formula?
Same.
Work=Force*Distance
Door knob.
Two surfaces move against one another.

4. What are first and third class levers used for?
Same.
To magnify the applied force.
A screw and a spur gear.
Two surfaces move against one another.

5. What is another way to find the mechanical advantage of an inclined plane?
To speed up the motion of resistence.
Can change the direction of motion.
32/8 = 4
Length of ramp/length of height from floor to truck

6. How is work done?
Feet.
To raise a house or other heavy machinery.
The force used to overcome friction is greater than the force used to do useful work.
When a resistance is overcome by a force acting through a measurable distance.

7. Friction is involved when?
Wheel and axle.
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.
Two surfaces move against one another.
The change of the direction of the pull.

8. What direction does the effort and resistance move in first class levers?
Mechanical disadvantage. Use more force than the force of the load you lift.
Feet.
Opposite.
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

9. 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.
your arm.
A few thousandths of an inch.
Feet.

10. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Same.
Two surfaces move against one another.
When a resistance is overcome by a force acting through a measurable distance.
Equals the weight of the object being hoisted.

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?
Shafts lying at any given angle.
32/8 = 4
The force used to overcome friction is greater than the force used to do useful work.
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

12. What is another example of a wheel and axle?
Door knob.
Increase or decrease the the speed of the applied motion.
Count the number of parts of the rope going to and from the movable block.
Gravity - Magnetism - Friction - Recoil

13. The worm gear is a combination of what?
A screw and a spur gear.
Wheel and axle.
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.

14. Gears can do a job for you by changing what three things?
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.
Count the number of parts of the rope going to and from the movable block.
Direction - speed or size of the force applied.

15. What direction does the effort and resistance move in third class levers.
Two surfaces move against one another.
Same.
Door knob.
Foot- pounds

16. Fractional mechanical advantage
Mechanical disadvantage. Use more force than the force of the load you lift.
In pounds.
To magnify the applied force.
2(pie)/pitch

17. What is the jack screw used for?
To raise a house or other heavy machinery.
fulcrum- weight- effort
32/8 = 4
The rope that passes through your hands is greater than the distance that the load is raised.

18. How is force measured in work?
32/8 = 4
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Shafts lying at any given angle.
In pounds.

19. What is the power formula?
Power=Work/Time
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
In pounds.
To speed up the motion of resistence.

20. What type of lever provides a fractional mechanical advantage?
32/8 = 4
Opposite.
Equals the weight of the object being hoisted.
Third class lever.

21. What kind of mechanical advantage does the first and second class lever provide?
Direction - speed or size of the force applied.
Third class lever.
Positive mechanical advantage.
Shafts lying at any given angle.

22. What is the first thing a gear can do?
Can change the direction of motion.
2(pie)/pitch
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.

23. What is the ratio of any gear train?
Positive mechanical advantage.
Same.
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.

24. What is the formula for the wheel and axle?
A screw and a spur gear.
Equals the weight of the object being hoisted.
Less than 1.
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

25. A miter gear connects what?
Connects shafts having a 90 degree angle.
The change of the direction of the pull.
A modification of an inclined plane.
32/8 = 4

26. What is the purpose of a third class lever?
The force used to overcome friction is greater than the force used to do useful work.
With oil - grease or soap.
To speed up the motion of resistence.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

27. The miter gear faces are beveled at what angle?
Same.
45
Third class lever.
Feet.

28. How do you find the mechanical advantage?
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.
The change of the direction of the pull.
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.

29. With a single fixed sheave what is the only 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.
Same.
The change of the direction of the pull.
Two surfaces move against one another.

30. How is distance measured in work?
Gravity - Magnetism - Friction - Recoil
Feet.
To magnify the applied force.
The force used to overcome friction is greater than the force used to do useful work.

31. How do you measure power?
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.
Magnify or reduce the force which you apply.
In Horsepower.

32. How can you figure out the mechanical advantage of most block and falls by glance?
your arm.
Count the number of parts of the rope going to and from the movable block.
The change of the direction of the pull.
Same.

33. What is the mechanical advantage for a single fixed block?
1
In pounds.
The force used to overcome friction is greater than the force used to do useful work.
Opposite.

34. What is the theoretical mechanical advantage of any gear train?
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.
A modification of an inclined plane.
With oil - grease or soap.

35. What direction does the effort and resistance move in the second class levers?
To raise a house or other heavy machinery.
A few thousandths of an inch.
Same.
In Horsepower.

36. Work is measured in units also known as?
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Foot- pounds
A few thousandths of an inch.

37. The threads of a screw are cut so?
Shafts lying at any given angle.
Count the number of parts of the rope going to and from the movable block.
To speed up the motion of resistence.
The force used to overcome friction is greater than the force used to do useful work.

38. What is the mechanical advantage of a single movable block?
Less than 1.
Foot- pounds
2. Each half of the rope carries an equal amount of weight.
Equals the weight of the object being hoisted.

39. What is the formula for the mechanical advantage of a screw?
Gravity - Magnetism - Friction - Recoil
Magnify or reduce the force which you apply.
2(pie)/pitch
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

40. 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.
Simple machine
Power=Work/Time
When a resistance is overcome by a force acting through a measurable distance.

41. What does a micrometer measure?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
A few thousandths of an inch.
Two surfaces move against one another.
Work=Force*Distance

42. What kind of machine is the inclined plane?
Foot- pounds
When a resistance is overcome by a force acting through a measurable distance.
Simple machine
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

43. What is the second thing a gear can do?
Connects shafts having a 90 degree angle.
45
2. Each half of the rope carries an equal amount of weight.
Increase or decrease the the speed of the applied motion.

44. What is an example of a third class lever?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Length of ramp/length of height from floor to truck
45
your arm.

45. An egg beater has a mechanical advantage of what?
Less than 1.
To raise a house or other heavy machinery.
Mechanical disadvantage. Use more force than the force of the load you lift.
2. Each half of the rope carries an equal amount of weight.

46. What is one type of second class lever?
your arm.
Wheel and axle.
Simple machine
Feet.

47. What is the third thing a gear can do?
Less than 1.
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.
Magnify or reduce the force which you apply.

48. Class two lever
To magnify the applied force.
fulcrum- weight- effort
2(pie)/pitch
Feet.

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

50. What are the 4 forces?
Gravity - Magnetism - Friction - Recoil
A modification of an inclined plane.
The change of the direction of the pull.
Third class lever.

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