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Mechanical Systems 3

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Answer 50 questions in 15 minutes.
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1. An egg beater has a mechanical advantage of what?
A modification of an inclined plane.
your arm.
When a resistance is overcome by a force acting through a measurable distance.
Less than 1.

2. What are first and third class levers used for?
Same.
A modification of an inclined plane.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
To magnify the applied force.

3. The miter gear faces are beveled at what angle?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
45
Feet.
Wheel and axle.

4. What direction does the effort and resistance move in first class levers?
Count the number of parts of the rope going to and from the movable block.
Opposite.
Gravity - Magnetism - Friction - Recoil
Magnify or reduce the force which you apply.

5. Work is measured in units also known as?
To speed up the motion of resistence.
Foot- pounds
To magnify the applied force.
Count the number of parts of the rope going to and from the movable block.

6. What is the second thing a gear can do?
To speed up the motion of resistence.
To magnify the applied force.
A few thousandths of an inch.
Increase or decrease the the speed of the applied motion.

7. What is the mechanical advantage of a single movable 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. Each half of the rope carries an equal amount of weight.
Two surfaces move against one another.
Magnify or reduce the force which you apply.

8. hat is a screw?
Feet.
2(pie)/pitch
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.

9. 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?
Foot- pounds
2. Each half of the rope carries an equal amount of weight.
Can change the direction of motion.
32/8 = 4

10. What is an example of a third class lever?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Can change the direction of motion.
your arm.
Same.

11. What is the theoretical mechanical advantage of any gear train?
Same.
Two surfaces move against one another.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Third class lever.

12. How is force measured in work?
With oil - grease or soap.
Same.
In pounds.
Length of ramp/length of height from floor to truck

13. Gears can do a job for you by changing what three things?
Third class lever.
Direction - speed or size of the force applied.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
To speed up the motion of resistence.

14. What does a micrometer measure?
A few thousandths of an inch.
2(pie)/pitch
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Feet.

15. What is the third thing a gear can do?
Magnify or reduce the force which you apply.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
your arm.
With oil - grease or soap.

16. What is one type of second class lever?
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
Same.
Wheel and axle.

17. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
2. Each half of the rope carries an equal amount of weight.
The rope that passes through your hands is greater than the distance that the load is raised.
In pounds.
Same.

18. Class two lever
32/8 = 4
Door knob.
fulcrum- weight- effort
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

19. With a single fixed sheave what is the only mechanical advantage?
Direction - speed or size of the force applied.
The change of the direction of the pull.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Feet.

20. Fractional mechanical advantage
Simple machine
Foot- pounds
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.

21. How do you find the mechanical advantage?
Equals the weight of the object being hoisted.
Shafts lying at any given angle.
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.

22. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
In Horsepower.
Magnify or reduce the force which you apply.
Equals the weight of the object being hoisted.
Same.

23. What is the purpose of a third class lever?
To speed up the motion of resistence.
2. Each half of the rope carries an equal amount of weight.
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.

24. What kind of mechanical advantage does the first and second class lever provide?
Third class lever.
Direction - speed or size of the force applied.
Positive mechanical advantage.
Door knob.

25. What direction does the effort and resistance move in third class levers.
A screw and a spur gear.
Door knob.
When a resistance is overcome by a force acting through a measurable distance.
Same.

26. What type of lever provides a fractional mechanical advantage?
Third class lever.
With oil - grease or soap.
Door knob.
your arm.

27. The bevel gear is used to connect what?
Positive mechanical advantage.
Shafts lying at any given angle.
A modification of an inclined plane.
Foot- pounds

28. A miter gear connects what?
Direction - speed or size of the force applied.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Connects shafts having a 90 degree angle.

29. How can you figure out the mechanical advantage of most block and falls by glance?
32/8 = 4
Count the number of parts of the rope going to and from the movable block.
In Horsepower.
Door knob.

30. The threads of a screw are cut so?
The force used to overcome friction is greater than the force used to do useful work.
To speed up the motion of resistence.
Positive mechanical advantage.
In Horsepower.

31. What are the 4 forces?
Shafts lying at any given angle.
Gravity - Magnetism - Friction - Recoil
The change of the direction of the pull.
your arm.

32. How is distance measured in work?
To speed up the motion of resistence.
A few thousandths of an inch.
Door knob.
Feet.

33. How is work done?
Foot- pounds
With oil - grease or soap.
When a resistance is overcome by a force acting through a measurable distance.
A screw and a spur gear.

34. What is the mechanical advantage for a single fixed block?
Length of ramp/length of height from floor to truck
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.
1

35. What is another example of a wheel and axle?
Power=Work/Time
Wheel and axle.
Door knob.
Work=Force*Distance

36. Friction is involved when?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
your arm.
Foot- pounds
Two surfaces move against one another.

37. 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.
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
Same.
To speed up the motion of resistence.

38. What kind of machine is the inclined plane?
Wheel and axle.
Length of ramp/length of height from floor to truck
Simple machine
Magnify or reduce the force which you apply.

39. What is the formula for the wheel and axle?
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
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.
Can change the direction of motion.

40. What is the power formula?
When a resistance is overcome by a force acting through a measurable distance.
A modification of an inclined plane.
Power=Work/Time
To speed up the motion of resistence.

41. What is another way to find the mechanical advantage of an inclined plane?
Magnify or reduce the force which you apply.
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.

42. What is the first thing a gear can do?
Third class lever.
Equals the weight of the object being hoisted.
Can change the direction of motion.
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.

43. What is the jack screw used for?
To raise a house or other heavy machinery.
Length of ramp/length of height from floor to truck
In Horsepower.
A screw and a spur gear.

44. How can you decrease friction on flat surfaces?
With oil - grease or soap.
To magnify the applied force.
Work=Force*Distance
fulcrum- weight- effort

45. What is the work formula?
Gravity - Magnetism - Friction - Recoil
Foot- pounds
2(pie)/pitch
Work=Force*Distance

46. What is the ratio of any gear train?
Can change the direction of motion.
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 few thousandths of an inch.
When a resistance is overcome by a force acting through a measurable distance.

47. How do you measure power?
Opposite.
Magnify or reduce the force which you apply.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
In Horsepower.

48. Formula for fractional mechanical disadvantage.
Same.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
The change of the direction of the pull.
In pounds.

49. The worm gear is a combination of what?
Power=Work/Time
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.
In Horsepower.

50. What is the formula for the mechanical advantage of a screw?
Magnify or reduce the force which you apply.
2(pie)/pitch
Direction - speed or size of the force applied.
your arm.

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Mechanical Systems 3

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