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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 type of lever provides a fractional mechanical advantage?
Same.
32/8 = 4
To raise a house or other heavy machinery.
Third class lever.

2. What direction does the effort and resistance move in the second class levers?
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
When a resistance is overcome by a force acting through a measurable distance.
Same.
Work=Force*Distance

3. Gears can do a job for you by changing what three things?
Direction - speed or size of the force applied.
Gravity - Magnetism - Friction - Recoil
Power=Work/Time
A few thousandths of an inch.

4. Formula for fractional mechanical disadvantage.
Two surfaces move against one another.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
2(pie)/pitch
Wheel and axle.

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

6. What is the third thing a gear can do?
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.
Magnify or reduce the force which you apply.
Feet.

7. hat is a screw?
Direction - speed or size of the force applied.
Length of ramp/length of height from floor to truck
A modification of an inclined plane.
Door knob.

8. With a single fixed sheave what is the only mechanical advantage?
The change of the direction of the pull.
The rope that passes through your hands is greater than the distance that the load is raised.
Wheel and axle.
To magnify the applied force.

9. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Door knob.
Feet.
Equals the weight of the object being hoisted.
Wheel and axle.

10. What is the purpose of a third class lever?
Positive mechanical advantage.
To speed up the motion of resistence.
2. Each half of the rope carries an equal amount of weight.
A modification of an inclined plane.

11. What is the first thing a gear can do?
When a resistance is overcome by a force acting through a measurable distance.
Positive mechanical advantage.
The rope that passes through your hands is greater than the distance that the load is raised.
Can change the direction of motion.

12. The threads of a screw are cut so?
2(pie)/pitch
Magnify or reduce the force which you apply.
The force used to overcome friction is greater than the force used to do useful work.
In Horsepower.

13. What is the theoretical mechanical advantage of any gear train?
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.
2. Each half of the rope carries an equal amount of weight.
Count the number of parts of the rope going to and from the movable block.

14. Friction is involved when?
Two surfaces move against one another.
In Horsepower.
Gravity - Magnetism - Friction - Recoil
To raise a house or other heavy machinery.

15. 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?
Door knob.
32/8 = 4
Gravity - Magnetism - Friction - Recoil
Length of ramp/length of height from floor to truck

16. What is the mechanical advantage for a single fixed block?
1
Magnify or reduce the force which you apply.
Connects shafts having a 90 degree angle.
45

17. What is the second thing a gear can do?
With oil - grease or soap.
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 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.

18. What are first and third class levers used for?
When a resistance is overcome by a force acting through a measurable distance.
To magnify the applied force.
Work=Force*Distance
A few thousandths of an inch.

19. What is an example of a third class lever?
Opposite.
Wheel and axle.
your arm.
To raise a house or other heavy machinery.

20. A miter gear connects what?
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.
When a resistance is overcome by a force acting through a measurable distance.
Connects shafts having a 90 degree angle.

21. The worm gear is a combination of what?
A screw and a spur gear.
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 modification of an inclined plane.
In pounds.

22. What are the 4 forces?
In Horsepower.
With oil - grease or soap.
Gravity - Magnetism - Friction - Recoil
To magnify the applied force.

23. What kind of machine is the inclined plane?
Simple machine
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
With oil - grease or soap.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

24. What is the work formula?
Wheel and axle.
Feet.
Magnify or reduce the force which you apply.
Work=Force*Distance

25. Class two lever
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.
fulcrum- weight- effort

26. How do you find the mechanical advantage?
32/8 = 4
Less than 1.
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.

27. How is distance measured in work?
Mechanical disadvantage. Use more force than the force of the load you lift.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Feet.

28. What is the jack screw used for?
2. Each half of the rope carries an equal amount of weight.
Wheel and axle.
When a resistance is overcome by a force acting through a measurable distance.
To raise a house or other heavy machinery.

29. 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.
Count the number of parts of the rope going to and from the movable block.
Mechanical disadvantage. Use more force than the force of the load you lift.

30. An egg beater has a mechanical advantage of what?
Door knob.
Feet.
Increase or decrease the the speed of the applied motion.
Less than 1.

31. How is force measured in work?
The change of the direction of the pull.
Opposite.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
In pounds.

32. What is the formula for the mechanical advantage of a screw?
Less than 1.
2(pie)/pitch
Foot- pounds
To speed up the motion of resistence.

33. What does a micrometer measure?
1
Less than 1.
A few thousandths of an inch.
your arm.

34. What kind of mechanical advantage does the first and second class lever provide?
To speed up the motion of resistence.
Equals the weight of the object being hoisted.
Count the number of parts of the rope going to and from the movable block.
Positive mechanical advantage.

35. 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.
In pounds.
Opposite.
Feet.

36. What direction does the effort and resistance move in third class levers.
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
Same.
Increase or decrease the the speed of the applied motion.

37. The miter gear faces are beveled at what angle?
The force used to overcome friction is greater than the force used to do useful work.
To raise a house or other heavy machinery.
45
A few thousandths of an inch.

38. How do you measure power?
Same.
fulcrum- weight- effort
Increase or decrease the the speed of the applied motion.
In Horsepower.

39. What is the lever formula?
2. Each half of the rope carries an equal amount of weight.
Positive mechanical advantage.
Shafts lying at any given angle.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

40. Fractional mechanical advantage
Same.
Equals the weight of the object being hoisted.
Mechanical disadvantage. Use more force than the force of the load you lift.
A modification of an inclined plane.

41. Work is measured in units also known as?
Equals the weight of the object being hoisted.
When a resistance is overcome by a force acting through a measurable distance.
Foot- pounds
Power=Work/Time

42. The bevel gear is used to connect what?
Shafts lying at any given angle.
Same.
The rope that passes through your hands is greater than the distance that the load is raised.
The change of the direction of the pull.

43. What direction does the effort and resistance move in first class levers?
Direction - speed or size of the force applied.
The rope that passes through your hands is greater than the distance that the load is raised.
Opposite.
32/8 = 4

44. What is the ratio of any gear train?
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.
fulcrum- weight- effort
Direction - speed or size of the force applied.

45. How can you figure out the mechanical advantage of most block and falls by glance?
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.
To speed up the motion of resistence.
fulcrum- weight- effort
Count the number of parts of the rope going to and from the movable block.

46. What is the mechanical advantage of a single movable block?
32/8 = 4
Wheel and axle.
Shafts lying at any given angle.
2. Each half of the rope carries an equal amount of weight.

47. How is work done?
When a resistance is overcome by a force acting through a measurable distance.
fulcrum- weight- effort
The rope that passes through your hands is greater than the distance that the load is raised.
32/8 = 4

48. What is another example of a wheel and axle?
Connects shafts having a 90 degree angle.
Door knob.
The rope that passes through your hands is greater than the distance that the load is raised.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

49. How can you decrease friction on flat surfaces?
Equals the weight of the object being hoisted.
With oil - grease or soap.
Magnify or reduce the force which you apply.
1

50. What is the power formula?
To magnify the applied force.
Count the number of parts of the rope going to and from the movable block.
Opposite.
Power=Work/Time