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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. Fractional mechanical advantage
Mechanical disadvantage. Use more force than the force of the load you lift.
fulcrum- weight- effort
Opposite.
A few thousandths of an inch.

2. 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.
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
The change of the direction of the pull.

3. How is distance measured in work?
Foot- pounds
The change of the direction of the pull.
In Horsepower.
Feet.

4. What is the ratio of any gear train?
A few thousandths of an inch.
Less than 1.
To magnify the applied force.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

5. The threads of a screw are cut so?
fulcrum- weight- effort
Gravity - Magnetism - Friction - Recoil
In Horsepower.
The force used to overcome friction is greater than the force used to do useful work.

6. What is the purpose 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.
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.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

7. What is the theoretical mechanical advantage of any gear train?
Third class lever.
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.
Opposite.

8. What is the formula for the mechanical advantage of a screw?
Two surfaces move against one another.
2. Each half of the rope carries an equal amount of weight.
Shafts lying at any given angle.
2(pie)/pitch

9. What direction does the effort and resistance move in third class levers.
Power=Work/Time
Same.
To magnify the applied force.
To raise a house or other heavy machinery.

10. What is another example of a wheel and axle?
fulcrum- weight- effort
2. Each half of the rope carries an equal amount of weight.
Wheel and axle.
Door knob.

11. What is the mechanical advantage of a single movable block?
The rope that passes through your hands is greater than the distance that the load is raised.
When a resistance is overcome by a force acting through a measurable distance.
Same.
2. Each half of the rope carries an equal amount of weight.

12. How is force measured in work?
A modification of an inclined plane.
Power=Work/Time
Feet.
In pounds.

13. What are the 4 forces?
Gravity - Magnetism - Friction - Recoil
Feet.
45
Door knob.

14. 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
45
Power=Work/Time
Count the number of parts of the rope going to and from the movable block.

15. How do you find the mechanical advantage?
Door knob.
With oil - grease or soap.
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.

16. What direction does the effort and resistance move in first class levers?
Opposite.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Gravity - Magnetism - Friction - Recoil
32/8 = 4

17. How can you decrease friction on flat surfaces?
With oil - grease or soap.
Feet.
In Horsepower.
2. Each half of the rope carries an equal amount of weight.

18. What is one type of second class lever?
Wheel and axle.
Magnify or reduce the force which you apply.
Simple machine
In Horsepower.

19. What is the mechanical advantage for a single fixed block?
Positive mechanical advantage.
1
To raise a house or other heavy machinery.
Power=Work/Time

20. What is the work formula?
A few thousandths of an inch.
Simple machine
Shafts lying at any given angle.
Work=Force*Distance

21. What kind of mechanical advantage does the first and second class lever provide?
Power=Work/Time
Equals the weight of the object being hoisted.
Simple machine
Positive mechanical advantage.

22. What is the first thing a gear can do?
Can change the direction of motion.
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
A few thousandths of an inch.
The rope that passes through your hands is greater than the distance that the load is raised.

23. 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
Opposite.
Mechanical disadvantage. Use more force than the force of the load you lift.
fulcrum- weight- effort

24. hat is a screw?
Same.
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
Equals the weight of the object being hoisted.

25. What is the power formula?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
To raise a house or other heavy machinery.
Mechanical disadvantage. Use more force than the force of the load you lift.
Power=Work/Time

26. Friction is involved when?
Count the number of parts of the rope going to and from the movable block.
Work=Force*Distance
Mechanical disadvantage. Use more force than the force of the load you lift.
Two surfaces move against one another.

27. The worm gear is a combination of what?
Mechanical disadvantage. Use more force than the force of the load you lift.
To speed up the motion of resistence.
A screw and a spur gear.
your arm.

28. Work is measured in units also known as?
Foot- pounds
your arm.
Connects shafts having a 90 degree angle.
Count the number of parts of the rope going to and from the movable block.

29. What does a micrometer measure?
A few thousandths of an inch.
In pounds.
When a resistance is overcome by a force acting through a measurable distance.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

30. 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.
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.
To speed up the motion of resistence.

31. Class two lever
To raise a house or other heavy machinery.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
fulcrum- weight- effort
Direction - speed or size of the force applied.

32. What is the second thing a gear can do?
To magnify the applied force.
Shafts lying at any given angle.
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
Increase or decrease the the speed of the applied motion.

33. What direction does the effort and resistance move in the second class levers?
Same.
Connects shafts having a 90 degree angle.
2. Each half of the rope carries an equal amount of weight.
Wheel and axle.

34. Formula for fractional mechanical disadvantage.
To magnify the applied force.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Work=Force*Distance
The force used to overcome friction is greater than the force used to do useful work.

35. With a single fixed sheave what is the only mechanical advantage?
Feet.
Gravity - Magnetism - Friction - Recoil
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.

36. What is another way to find the mechanical advantage of an inclined plane?
In Horsepower.
Door knob.
Length of ramp/length of height from floor to truck
Two surfaces move against one another.

37. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Door knob.
Feet.
Length of ramp/length of height from floor to truck
Equals the weight of the object being hoisted.

38. What is the jack screw used for?
45
To raise a house or other heavy machinery.
32/8 = 4
In Horsepower.

39. Gears can do a job for you by changing what three things?
Direction - speed or size of the force applied.
Less than 1.
The force used to overcome friction is greater than the force used to do useful work.
Same.

40. A miter gear connects what?
Connects shafts having a 90 degree angle.
2. Each half of the rope carries an equal amount of weight.
To speed up the motion of resistence.
Simple machine

41. What are first and third class levers used for?
32/8 = 4
To magnify the applied force.
Shafts lying at any given angle.
Less than 1.

42. How is work done?
Third class lever.
When a resistance is overcome by a force acting through a measurable distance.
To raise a house or other heavy machinery.
In pounds.

43. 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.
To raise a house or other heavy machinery.
A few thousandths of an inch.
Feet.

44. What is the third thing a gear can do?
To raise a house or other heavy machinery.
2(pie)/pitch
Magnify or reduce the force which you apply.
Same.

45. What kind of machine is the inclined plane?
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
Less than 1.
Simple machine

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

47. 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.
The rope that passes through your hands is greater than the distance that the load is raised.
To raise a house or other heavy machinery.
your arm.

48. What type of lever provides a fractional mechanical advantage?
Same.
Third class lever.
In pounds.
Length of ramp/length of height from floor to truck

49. The miter gear faces are beveled at what angle?
When a resistance is overcome by a force acting through a measurable distance.
Shafts lying at any given angle.
Same.
45

50. How do you measure power?
In Horsepower.
Simple machine
With oil - grease or soap.
Gravity - Magnetism - Friction - Recoil