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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 work formula?
When a resistance is overcome by a force acting through a measurable distance.
45
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Work=Force*Distance

2. Gears can do a job for you by changing what three things?
A screw and a spur gear.
Increase or decrease the the speed of the applied motion.
In Horsepower.
Direction - speed or size of the force applied.

3. How do you find the mechanical advantage?
Connects shafts having a 90 degree angle.
fulcrum- weight- effort
Foot- pounds
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 one type of second class lever?
Work=Force*Distance
Can change the direction of motion.
Wheel and axle.
Foot- pounds

5. Class two lever
Simple machine
fulcrum- weight- effort
Connects shafts having a 90 degree angle.
A modification of an inclined plane.

6. What is the theoretical mechanical advantage of any gear train?
Foot- pounds
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
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.

7. How do you measure power?
To raise a house or other heavy machinery.
The force used to overcome friction is greater than the force used to do useful work.
Power=Work/Time
In Horsepower.

8. What is the mechanical advantage of a single movable block?
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.
Opposite.
Positive mechanical advantage.

9. What type of lever provides a fractional mechanical advantage?
A modification of an inclined plane.
Third class lever.
Increase or decrease the the speed of the applied motion.
45

10. What kind of mechanical advantage does the first and second class lever provide?
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.
The force used to overcome friction is greater than the force used to do useful work.
Positive mechanical advantage.

11. With a single fixed sheave what is the only mechanical advantage?
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.
Third class lever.
Connects shafts having a 90 degree angle.

12. How is work done?
Shafts lying at any given angle.
your arm.
When a resistance is overcome by a force acting through a measurable distance.
In Horsepower.

13. What is another example of a wheel and axle?
Power=Work/Time
32/8 = 4
Door knob.
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

14. What is the mechanical advantage for a single fixed block?
Wheel and axle.
The change of the direction of the pull.
To raise a house or other heavy machinery.
1

15. What is the third thing a gear can do?
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
Magnify or reduce the force which you apply.
Positive mechanical advantage.
45

16. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
Simple machine
The rope that passes through your hands is greater than the distance that the load is raised.
your arm.
Door knob.

17. The bevel gear is used to connect what?
Increase or decrease the the speed of the applied motion.
Shafts lying at any given angle.
45
Connects shafts having a 90 degree angle.

18. What does a micrometer measure?
2. Each half of the rope carries an equal amount of weight.
With oil - grease or soap.
A few thousandths of an inch.
A modification of an inclined plane.

19. Friction is involved when?
Two surfaces move against one another.
Same.
Feet.
Increase or decrease the the speed of the applied motion.

20. What are first and third class levers used for?
1
To speed up the motion of resistence.
To magnify the applied force.
Mechanical disadvantage. Use more force than the force of the load you lift.

21. What is the formula for the wheel and axle?
1
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
Length of ramp/length of height from floor to truck

22. What is another way to find the mechanical advantage of an inclined plane?
Same.
Length of ramp/length of height from floor to truck
Third class lever.
Count the number of parts of the rope going to and from the movable block.

23. What is the ratio of any gear train?
With oil - grease or soap.
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.
Mechanical disadvantage. Use more force than the force of the load you lift.

24. What direction does the effort and resistance move in third class levers.
Same.
A modification of an inclined plane.
To speed up the motion of resistence.
A few thousandths of an inch.

25. How is force measured in work?
To magnify the applied force.
Simple machine
your arm.
In pounds.

26. What are the 4 forces?
Gravity - Magnetism - Friction - Recoil
A screw and a spur gear.
Magnify or reduce the force which you apply.
To raise a house or other heavy machinery.

27. The miter gear faces are beveled at what angle?
45
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.
Direction - speed or size of the force applied.

28. Work is measured in units also known as?
45
Foot- pounds
With oil - grease or soap.
Feet.

29. What direction does the effort and resistance move in first class levers?
Opposite.
A few thousandths of an inch.
Count the number of parts of the rope going to and from the movable block.
Same.

30. A miter gear connects what?
Count the number of parts of the rope going to and from the movable block.
Connects shafts having a 90 degree angle.
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.

31. Fractional mechanical advantage
A few thousandths of an inch.
Mechanical disadvantage. Use more force than the force of the load you lift.
Third class lever.
Connects shafts having a 90 degree angle.

32. 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?
Simple machine
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 magnify the applied force.
32/8 = 4

33. What is the lever formula?
Positive mechanical advantage.
Foot- pounds
With oil - grease or soap.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

34. What is the second thing a gear can do?
Increase or decrease the the speed of the applied motion.
Equals the weight of the object being hoisted.
In Horsepower.
Direction - speed or size of the force applied.

35. What direction does the effort and resistance move in the second class levers?
Same.
To magnify the applied force.
In pounds.
A few thousandths of an inch.

36. What is the formula for the mechanical advantage of a screw?
Equals the weight of the object being hoisted.
To magnify the applied force.
Direction - speed or size of the force applied.
2(pie)/pitch

37. hat is a screw?
your arm.
Door knob.
A modification of an inclined plane.
Equals the weight of the object being hoisted.

38. How can you figure out the mechanical advantage of most block and falls by glance?
In pounds.
Gravity - Magnetism - Friction - Recoil
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Count the number of parts of the rope going to and from the movable block.

39. What is the power formula?
Same.
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.
Can change the direction of motion.

40. How can you decrease friction on flat surfaces?
Direction - speed or size of the force applied.
1
Count the number of parts of the rope going to and from the movable block.
With oil - grease or soap.

41. The threads of a screw are cut so?
Power=Work/Time
A screw and a spur gear.
Wheel and axle.
The force used to overcome friction is greater than the force used to do useful work.

42. What is the jack screw used for?
To raise a house or other heavy machinery.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Direction - speed or size of the force applied.
2(pie)/pitch

43. What kind of machine is the inclined plane?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
The change of the direction of the pull.
Simple machine
Equals the weight of the object being hoisted.

44. How is distance measured in work?
Feet.
Same.
In pounds.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

45. What is the purpose of a third class lever?
To speed up the motion of resistence.
Power=Work/Time
A few thousandths of an inch.
Mechanical disadvantage. Use more force than the force of the load you lift.

46. What is an example of a third class lever?
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.
To raise a house or other heavy machinery.
Connects shafts having a 90 degree angle.

47. What is the first thing a gear can do?
2(pie)/pitch
Third class lever.
Door knob.
Can change the direction of motion.

48. The worm gear is a combination of what?
A modification of an inclined plane.
Can change the direction of motion.
1
A screw and a spur gear.

49. Formula for fractional mechanical disadvantage.
Foot- pounds
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
1
Less than 1.

50. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Equals the weight of the object being hoisted.
With oil - grease or soap.
Length of ramp/length of height from floor to truck
1

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Mechanical Systems 3

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