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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 is the work formula?
Feet.
Work=Force*Distance
A modification of an inclined plane.
Shafts lying at any given angle.

2. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
Length of ramp/length of height from floor to truck
Work=Force*Distance
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
The rope that passes through your hands is greater than the distance that the load is raised.

3. What is the jack screw used for?
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
Shafts lying at any given angle.
Gravity - Magnetism - Friction - Recoil
To raise a house or other heavy machinery.

4. What direction does the effort and resistance move in first class levers?
Opposite.
Foot- pounds
When a resistance is overcome by a force acting through a measurable distance.
1

5. The threads of a screw are cut so?
The force used to overcome friction is greater than the force used to do useful work.
Same.
Less than 1.
1

6. Class two lever
Count the number of parts of the rope going to and from the movable block.
2(pie)/pitch
fulcrum- weight- effort
Same.

7. What is the ratio of any gear train?
Shafts lying at any given angle.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
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.

8. What is the purpose of a third class lever?
To speed up the motion of resistence.
Less than 1.
45
your arm.

9. What kind of machine is the inclined plane?
Simple machine
Gravity - Magnetism - Friction - Recoil
In Horsepower.
The rope that passes through your hands is greater than the distance that the load is raised.

10. 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.
Count the number of parts of the rope going to and from the movable block.
Third class lever.
Shafts lying at any given angle.

11. The miter gear faces are beveled at what angle?
Feet.
To speed up the motion of resistence.
Connects shafts having a 90 degree angle.
45

12. A miter gear connects what?
2. Each half of the rope carries an equal amount of weight.
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
Connects shafts having a 90 degree angle.
The rope that passes through your hands is greater than the distance that the load is raised.

13. What kind of mechanical advantage does the first and second class lever provide?
Positive mechanical advantage.
Shafts lying at any given angle.
Equals the weight of the object being hoisted.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

14. What is the formula for the wheel and axle?
Increase or decrease the the speed of the applied motion.
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
With oil - grease or soap.
Same.

15. The worm gear is a combination of what?
Same.
Same.
your arm.
A screw and a spur gear.

16. What are the 4 forces?
Foot- pounds
Third class lever.
Gravity - Magnetism - Friction - Recoil
Magnify or reduce the force which you apply.

17. How is work done?
When a resistance is overcome by a force acting through a measurable distance.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
The force used to overcome friction is greater than the force used to do useful work.
A screw and a spur gear.

18. With a single fixed sheave what is the only mechanical advantage?
Feet.
The change of the direction of the pull.
your arm.
Third class lever.

19. What is another example of a wheel and axle?
2(pie)/pitch
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
Door knob.
Opposite.

20. Work is measured in units also known as?
The force used to overcome friction is greater than the force used to do useful work.
Feet.
Mechanical disadvantage. Use more force than the force of the load you lift.
Foot- pounds

21. What is the theoretical mechanical advantage of any gear train?
Shafts lying at any given angle.
Direction - speed or size of the force applied.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
To raise a house or other heavy machinery.

22. What does a micrometer measure?
A few thousandths of an inch.
Equals the weight of the object being hoisted.
2(pie)/pitch
fulcrum- weight- effort

23. What direction does the effort and resistance move in third class levers.
Same.
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.
Connects shafts having a 90 degree angle.

24. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
A few thousandths of an inch.
Equals the weight of the object being hoisted.
To magnify the applied force.
Count the number of parts of the rope going to and from the movable block.

25. What is the mechanical advantage for a single fixed block?
The force used to overcome friction is greater than the force used to do useful work.
Gravity - Magnetism - Friction - Recoil
1
Increase or decrease the the speed of the applied motion.

26. How do you find the 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.
The rope that passes through your hands is greater than the distance that the load is raised.
In pounds.
In Horsepower.

27. What is another way to find the mechanical advantage of an inclined plane?
Work=Force*Distance
Length of ramp/length of height from floor to truck
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.

28. What is the mechanical advantage of a single movable block?
In Horsepower.
32/8 = 4
2. Each half of the rope carries an equal amount of weight.
The change of the direction of the pull.

29. How is force measured in work?
Can change the direction of motion.
In pounds.
Opposite.
Shafts lying at any given angle.

30. What are first and third class levers used for?
Feet.
To magnify the applied force.
Door knob.
Equals the weight of the object being hoisted.

31. What is the power formula?
The rope that passes through your hands is greater than the distance that the load is raised.
To speed up the motion of resistence.
Power=Work/Time
Simple machine

32. Fractional mechanical advantage
Mechanical disadvantage. Use more force than the force of the load you lift.
Connects shafts having a 90 degree angle.
45
A few thousandths of an inch.

33. What is the second thing a gear can do?
Door knob.
Increase or decrease the the speed of the applied motion.
Power=Work/Time
To raise a house or other heavy machinery.

34. What direction does the effort and resistance move in the second class levers?
Same.
The change of the direction of the pull.
1
Mechanical disadvantage. Use more force than the force of the load you lift.

35. What is the formula for the mechanical advantage of a screw?
Work=Force*Distance
your arm.
2(pie)/pitch
Length of ramp/length of height from floor to truck

36. How is distance measured in work?
45
Feet.
Gravity - Magnetism - Friction - Recoil
your arm.

37. What is the first thing a gear can do?
Can change the direction of motion.
32/8 = 4
Door knob.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

38. Formula for fractional mechanical disadvantage.
Count the number of parts of the rope going to and from the movable block.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Door knob.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

39. The bevel gear is used to connect what?
In pounds.
Power=Work/Time
Shafts lying at any given angle.
Increase or decrease the the speed of the applied motion.

40. What is the third thing a gear can do?
Magnify or reduce the force which you apply.
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
Positive mechanical advantage.
The rope that passes through your hands is greater than the distance that the load is raised.

41. 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.
Same.
A screw and a spur gear.

42. hat is a screw?
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Length of ramp/length of height from floor to truck
A modification of an inclined plane.
45

43. What type of lever provides a fractional mechanical advantage?
Positive mechanical advantage.
Third class lever.
Same.
Simple machine

44. Gears can do a job for you by changing what three things?
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.
Simple machine
Work=Force*Distance

45. What is an example of a third class lever?
Gravity - Magnetism - Friction - Recoil
To magnify the applied force.
Foot- pounds
your arm.

46. How do you measure power?
Less than 1.
In Horsepower.
Feet.
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

47. How can you figure out the mechanical advantage of most block and falls by glance?
Same.
your arm.
Power=Work/Time
Count the number of parts of the rope going to and from the movable block.

48. Friction is involved when?
Less than 1.
Opposite.
Two surfaces move against one another.
To raise a house or other heavy machinery.

49. 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.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Can change the direction of motion.
Wheel and axle.

50. 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
The change of the direction of the pull.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Can change the direction of motion.