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Mechanical Systems 3

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Answer 50 questions in 15 minutes.
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1. What is the power formula?
The force used to overcome friction is greater than the force used to do useful work.
Power=Work/Time
Opposite.
Can change the direction of motion.

2. What is the formula for the wheel and axle?
Connects shafts having a 90 degree angle.
Same.
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.

3. How do you measure power?
In pounds.
In Horsepower.
Positive 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.

4. What is the first thing a gear can do?
Can change the direction of motion.
Work=Force*Distance
In Horsepower.
32/8 = 4

5. A miter gear connects what?
Magnify or reduce the force which you apply.
Connects shafts having a 90 degree angle.
To magnify the applied force.
1

6. 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
To magnify the applied force.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
In pounds.

7. Class two lever
fulcrum- weight- effort
Opposite.
Feet.
Equals the weight of the object being hoisted.

8. What direction does the effort and resistance move in the second class levers?
Third class lever.
Length of ramp/length of height from floor to truck
Same.
Opposite.

9. What is the lever formula?
your arm.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
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.
Foot- pounds

10. The worm gear is a combination of what?
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.
Connects shafts having a 90 degree angle.
A few thousandths of an inch.

11. What is the mechanical advantage for a single fixed block?
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Power=Work/Time
1
Door knob.

12. What kind of machine is the inclined plane?
Connects shafts having a 90 degree angle.
32/8 = 4
Simple machine
Length of ramp/length of height from floor to truck

13. How can you decrease friction on flat surfaces?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Door knob.
Less than 1.
With oil - grease or soap.

14. What is the work formula?
Work=Force*Distance
Equals the weight of the object being hoisted.
When a resistance is overcome by a force acting through a measurable distance.
To speed up the motion of resistence.

15. Gears can do a job for you by changing what three things?
Direction - speed or size of the force applied.
Can change the direction of motion.
Gravity - Magnetism - Friction - Recoil
Count the number of parts of the rope going to and from the movable block.

16. What direction does the effort and resistance move in third class levers.
To magnify the applied force.
Length of ramp/length of height from floor to truck
Same.
A few thousandths of an inch.

17. Fractional mechanical advantage
To raise a house or other heavy machinery.
Mechanical disadvantage. Use more force than the force of the load you lift.
To magnify the applied force.
Two surfaces move against one another.

18. What is the purpose of a third class lever?
Opposite.
Feet.
To speed up the motion of resistence.
Length of ramp/length of height from floor to truck

19. What kind of mechanical advantage does the first and second class lever provide?
Power=Work/Time
2. Each half of the rope carries an equal amount of weight.
A modification of an inclined plane.
Positive mechanical advantage.

20. What is the third thing a gear can do?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Opposite.
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.

21. Friction is involved when?
In pounds.
Length of ramp/length of height from floor to truck
2(pie)/pitch
Two surfaces move against one another.

22. The bevel gear is used to connect what?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
The force used to overcome friction is greater than the force used to do useful work.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Shafts lying at any given angle.

23. What is the mechanical advantage of a single movable block?
1
Wheel and axle.
Simple machine
2. Each half of the rope carries an equal amount of weight.

24. What type of lever provides a fractional mechanical advantage?
When a resistance is overcome by a force acting through a measurable distance.
Third class lever.
In pounds.
The force used to overcome friction is greater than the force used to do useful work.

25. How do you find the mechanical advantage?
Third class lever.
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.
With oil - grease or soap.

26. What is the jack screw used for?
Less than 1.
Same.
To raise a house or other heavy machinery.
Door knob.

27. What is the theoretical mechanical advantage of any gear train?
The force used to overcome friction is greater than the force used to do useful work.
Less than 1.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Same.

28. The miter gear faces are beveled at what angle?
1
Power=Work/Time
Two surfaces move against one another.
45

29. What is the second thing a gear can do?
Shafts lying at any given angle.
Gravity - Magnetism - Friction - Recoil
To raise a house or other heavy machinery.
Increase or decrease the the speed of the applied motion.

30. How is force measured in work?
A screw and a spur gear.
Mechanical disadvantage. Use more force than the force of the load you lift.
In pounds.
Door knob.

31. An egg beater has a mechanical advantage of what?
Count the number of parts of the rope going to and from the movable block.
Less than 1.
Opposite.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

32. How is work done?
When a resistance is overcome by a force acting through a measurable distance.
fulcrum- weight- effort
Less than 1.
To raise a house or other heavy machinery.

33. What does a micrometer measure?
Length of ramp/length of height from floor to truck
Gravity - Magnetism - Friction - Recoil
Third class lever.
A few thousandths of an inch.

34. Formula for fractional mechanical disadvantage.
Door knob.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Gravity - Magnetism - Friction - Recoil
Same.

35. How can you figure out the mechanical advantage of most block and falls by glance?
With oil - grease or soap.
Opposite.
Count the number of parts of the rope going to and from the movable block.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

36. What is another way to find the mechanical advantage of an inclined plane?
Opposite.
Length of ramp/length of height from floor to truck
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
Foot- pounds

37. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
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
your arm.
Increase or decrease the the speed of the applied motion.
The rope that passes through your hands is greater than the distance that the load is raised.

38. What is an example of a third class lever?
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.
your arm.
Count the number of parts of the rope going to and from the movable block.

39. What is one type of second class lever?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Wheel and axle.
Increase or decrease the the speed of the applied motion.
Two surfaces move against one another.

40. What direction does the effort and resistance move in first class levers?
Magnify or reduce the force which you apply.
Opposite.
Power=Work/Time
Shafts lying at any given angle.

41. What is another example of a wheel and axle?
Two surfaces move against one another.
Foot- pounds
Door knob.
2(pie)/pitch

42. What are first and third class levers used for?
Same.
To speed up the motion of resistence.
To magnify the applied force.
Third class lever.

43. What is the ratio of any gear train?
Count the number of parts of the rope going to and from the movable block.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Magnify or reduce the force which you apply.
fulcrum- weight- effort

44. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Door knob.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Equals the weight of the object being hoisted.
The change of the direction of the pull.

45. How is distance measured in work?
Feet.
Door knob.
fulcrum- weight- effort
To raise a house or other heavy machinery.

46. What are the 4 forces?
A few thousandths of an inch.
Gravity - Magnetism - Friction - Recoil
When a resistance is overcome by a force acting through a measurable distance.
Opposite.

47. The threads of a screw are cut so?
Simple machine
fulcrum- weight- effort
The force used to overcome friction is greater than the force used to do useful work.
Length of ramp/length of height from floor to truck

48. What is the formula for the mechanical advantage of a screw?
To raise a house or other heavy machinery.
2(pie)/pitch
Connects shafts having a 90 degree angle.
To speed up the motion of resistence.

49. With a single fixed sheave what is the only mechanical advantage?
Two surfaces move against one another.
Magnify or reduce the force which you apply.
Can change the direction of motion.
The change of the direction of the pull.

50. hat is a screw?
To magnify the applied force.
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.
The force used to overcome friction is greater than the force used to do useful work.

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Mechanical Systems 3

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