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Mechanical Systems 3

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Answer 50 questions in 15 minutes.
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1. What direction does the effort and resistance move in first class levers?
A screw and a spur gear.
Two surfaces move against one another.
Opposite.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

2. What kind of machine is the inclined plane?
Third class lever.
Simple machine
Same.
Increase or decrease the the speed of the applied motion.

3. Friction is involved when?
Two surfaces move against one another.
To magnify the applied force.
Positive mechanical advantage.
The change of the direction of the pull.

4. How can you figure out the mechanical advantage of most block and falls by glance?
Count the number of parts of the rope going to and from the movable block.
your arm.
Can change the direction of motion.
A screw and a spur gear.

5. What is an example 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.
A screw and a spur gear.
Can change the direction of motion.
your arm.

6. What is the mechanical advantage for a single fixed block?
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.
45
1

7. What is the work formula?
In Horsepower.
Mechanical disadvantage. Use more force than the force of the load you lift.
Less than 1.
Work=Force*Distance

8. What does a micrometer measure?
A screw and a spur gear.
Power=Work/Time
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.

9. A miter gear connects what?
Can change the direction of motion.
Foot- pounds
Connects shafts having a 90 degree angle.
your arm.

10. 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.
Same.
Door knob.
Length of ramp/length of height from floor to truck

11. How is distance measured in work?
Power=Work/Time
Feet.
Foot- pounds
To raise a house or other heavy machinery.

12. How do you measure power?
In Horsepower.
Connects shafts having a 90 degree angle.
Less than 1.
A modification of an inclined plane.

13. What is the purpose of a third class lever?
Can change the direction of motion.
45
To speed up the motion of resistence.
Work=Force*Distance

14. What is another way to find the mechanical advantage of an inclined plane?
A screw and a spur gear.
To speed up the motion of resistence.
Less than 1.
Length of ramp/length of height from floor to truck

15. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Less than 1.
A screw and a spur gear.
Equals the weight of the object being hoisted.
Count the number of parts of the rope going to and from the movable block.

16. With a single fixed sheave what is the only mechanical advantage?
your arm.
Magnify or reduce the force which you apply.
The change of the direction of the pull.
Length of ramp/length of height from floor to truck

17. What direction does the effort and resistance move in third class levers.
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.
Power=Work/Time
Same.

18. How do you find the mechanical advantage?
32/8 = 4
Count the number of parts of the rope going to and from the 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.
Opposite.

19. Fractional mechanical advantage
Mechanical disadvantage. Use more force than the force of the load you lift.
To magnify the applied force.
A screw and a spur gear.
To speed up the motion of resistence.

20. What are the 4 forces?
Door knob.
Simple machine
The force used to overcome friction is greater than the force used to do useful work.
Gravity - Magnetism - Friction - Recoil

21. How is force measured in work?
Door knob.
Length of ramp/length of height from floor to truck
In pounds.
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

22. What is another example of a wheel and axle?
Can change the direction of motion.
Door knob.
Magnify or reduce the force which you apply.
Wheel and axle.

23. What is the third thing a gear can do?
Gravity - Magnetism - Friction - Recoil
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.
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.

24. Work is measured in units also known as?
Mechanical disadvantage. Use more force than the force of the load you lift.
When a resistance is overcome by a force acting through a measurable distance.
Magnify or reduce the force which you apply.
Foot- pounds

25. What are first and third class levers used for?
1
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.
To magnify the applied force.

26. The threads of a screw are cut so?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Power=Work/Time
The force used to overcome friction is greater than the force used to do useful work.
Connects shafts having a 90 degree angle.

27. What is the jack screw used for?
45
2(pie)/pitch
Door knob.
To raise a house or other heavy machinery.

28. What type of lever provides a fractional mechanical advantage?
Third class lever.
The rope that passes through your hands is greater than the distance that the load is raised.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by 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.

29. Class two lever
Connects shafts having a 90 degree angle.
fulcrum- weight- effort
Less than 1.
A few thousandths of an inch.

30. What is the lever formula?
Count the number of parts of the rope going to and from the movable block.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Mechanical disadvantage. Use more force than the force of the load you lift.
Same.

31. What is the theoretical mechanical advantage of any gear train?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Length of ramp/length of height from floor to truck
In Horsepower.
Count the number of parts of the rope going to and from the movable block.

32. How is work done?
1
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Connects shafts having a 90 degree angle.
When a resistance is overcome by a force acting through a measurable distance.

33. What is the first thing a gear can do?
32/8 = 4
Can change the direction of motion.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
With oil - grease or soap.

34. What is the power formula?
Power=Work/Time
Door knob.
When a resistance is overcome by a force acting through a measurable distance.
A few thousandths of an inch.

35. What direction does the effort and resistance move in the second class levers?
When a resistance is overcome by a force acting through a measurable distance.
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.
Gravity - Magnetism - Friction - Recoil

36. An egg beater has a mechanical advantage of what?
Less than 1.
Mechanical disadvantage. Use more force than the force of the load you lift.
Power=Work/Time
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

37. Gears can do a job for you by changing what three things?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Direction - speed or size of the force applied.
Feet.
Positive mechanical advantage.

38. 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.
Shafts lying at any given angle.
With oil - grease or soap.
Door knob.

39. The worm gear is a combination of what?
your arm.
A screw and a spur gear.
Same.
The change of the direction of the pull.

40. hat is a screw?
A modification of an inclined plane.
Shafts lying at any given angle.
The change of the direction of the pull.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

41. What is the formula for the mechanical advantage of a screw?
Opposite.
Increase or decrease the the speed of the applied motion.
Simple machine
2(pie)/pitch

42. Formula for fractional mechanical disadvantage.
Direction - speed or size of the force applied.
Third class lever.
Feet.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

43. What kind of mechanical advantage does the first and second class lever provide?
Positive mechanical advantage.
Power=Work/Time
Gravity - Magnetism - Friction - Recoil
In Horsepower.

44. The bevel gear is used to connect what?
Mechanical disadvantage. Use more force than the force of the load you lift.
Shafts lying at any given angle.
To raise a house or other heavy machinery.
With oil - grease or soap.

45. What is the mechanical advantage of a single movable block?
1
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.
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

46. 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?
Increase or decrease the the speed of the applied motion.
1
32/8 = 4
Simple machine

47. How can you decrease friction on flat surfaces?
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
fulcrum- weight- effort
With oil - grease or soap.
In Horsepower.

48. What is one type of second class lever?
Gravity - Magnetism - Friction - Recoil
Wheel and axle.
Count the number of parts of the rope going to and from the movable block.
32/8 = 4

49. What is the second thing a gear can do?
Increase or decrease the the speed of the applied motion.
Opposite.
fulcrum- weight- effort
32/8 = 4

50. What is the formula for the wheel and axle?
Opposite.
Positive mechanical advantage.
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

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Mechanical Systems 3

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