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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 lever formula?
A screw and a spur gear.
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.
1

2. How do you find the mechanical advantage?
your arm.
Foot- pounds
Connects shafts having a 90 degree angle.
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.

3. A miter gear connects what?
Connects shafts having a 90 degree angle.
Same.
The change of the direction of the pull.
The rope that passes through your hands is greater than the distance that the load is raised.

4. Friction is involved when?
Two surfaces move against one another.
Increase or decrease the the speed of the applied motion.
Wheel and axle.
Can change the direction of motion.

5. What is the first thing a gear can do?
Can change the direction of motion.
In Horsepower.
Work=Force*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

6. What is one type of second class lever?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Same.
Wheel and axle.
To speed up the motion of resistence.

7. What does a micrometer measure?
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
A few thousandths of an inch.
Two surfaces move against one another.

8. The miter gear faces are beveled at what angle?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
45
In Horsepower.
your arm.

9. What kind of machine is the inclined plane?
A modification of an inclined plane.
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
Two surfaces move against one another.
Simple machine

10. What is the power formula?
Positive mechanical advantage.
Power=Work/Time
Gravity - Magnetism - Friction - Recoil
Less than 1.

11. What is the mechanical advantage for a single fixed block?
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.
Third class lever.
1

12. hat is a screw?
A few thousandths of an inch.
Positive mechanical advantage.
With oil - grease or soap.
A modification of an inclined plane.

13. What is the mechanical advantage of a single movable block?
Connects shafts having a 90 degree angle.
2. Each half of the rope carries an equal amount of weight.
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.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

14. The threads of a screw are cut so?
The force used to overcome friction is greater than the force used to do useful work.
Wheel and axle.
In pounds.
Count the number of parts of the rope going to and from the movable block.

15. What direction does the effort and resistance move in third class levers.
Positive mechanical advantage.
Same.
Gravity - Magnetism - Friction - Recoil
Length of ramp/length of height from floor to truck

16. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
Work=Force*Distance
Door knob.
45
The rope that passes through your hands is greater than the distance that the load is raised.

17. What is the second thing a gear can do?
Increase or decrease the the speed of the applied motion.
Positive mechanical advantage.
fulcrum- weight- effort
In Horsepower.

18. Class two lever
To speed up the motion of resistence.
32/8 = 4
fulcrum- weight- effort
In Horsepower.

19. How is force measured in 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.
In pounds.
2. Each half of the rope carries an equal amount of weight.
With oil - grease or soap.

20. What is the theoretical mechanical advantage of any gear train?
Shafts lying at any given angle.
Gravity - Magnetism - Friction - Recoil
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.

21. Fractional mechanical advantage
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.
Increase or decrease the the speed of the applied motion.
Mechanical disadvantage. Use more force than the force of the load you lift.

22. What is the work formula?
Length of ramp/length of height from floor to truck
The rope that passes through your hands is greater than the distance that the load is raised.
Count the number of parts of the rope going to and from the movable block.
Work=Force*Distance

23. 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?
Connects shafts having a 90 degree angle.
32/8 = 4
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Gravity - Magnetism - Friction - Recoil

24. What is the ratio of any gear train?
A screw and a spur gear.
Connects shafts having a 90 degree 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.

25. What is the third thing a gear can do?
Equals the weight of the object being hoisted.
A few thousandths of an inch.
Magnify or reduce the force which you apply.
Can change the direction of motion.

26. Work is measured in units also known as?
Foot- pounds
To magnify the applied force.
A modification of an inclined plane.
The change of the direction of the pull.

27. What is another way to find the mechanical advantage of an inclined plane?
Connects shafts having a 90 degree angle.
Positive mechanical advantage.
Equals the weight of the object being hoisted.
Length of ramp/length of height from floor to truck

28. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Magnify or reduce the force which you apply.
Gravity - Magnetism - Friction - Recoil
In pounds.
Equals the weight of the object being hoisted.

29. What are first and third class levers used for?
Wheel and axle.
The change of the direction of the pull.
Magnify or reduce the force which you apply.
To magnify the applied force.

30. The worm gear is a combination of what?
A screw and a spur gear.
Door knob.
Same.
Wheel and axle.

31. Gears can do a job for you by changing what three things?
Same.
Direction - speed or size of the force applied.
Door knob.
Opposite.

32. How can you decrease friction on flat surfaces?
Direction - speed or size of the force applied.
Mechanical disadvantage. Use more force than the force of the load you lift.
With oil - grease or soap.
Two surfaces move against one another.

33. What is the formula for the mechanical advantage of a screw?
The rope that passes through your hands is greater than the distance that the load is raised.
2(pie)/pitch
Same.
Foot- pounds

34. The bevel gear is used to connect what?
The rope that passes through your hands is greater than the distance that the load is raised.
Shafts lying at any given angle.
Third class lever.
your arm.

35. How is distance measured in work?
Door knob.
Opposite.
Feet.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

36. How is work done?
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Third class lever.
When a resistance is overcome by a force acting through a measurable distance.
Gravity - Magnetism - Friction - Recoil

37. What direction does the effort and resistance move in first class levers?
Feet.
Count the number of parts of the rope going to and from the movable block.
Opposite.
your arm.

38. What kind of mechanical advantage does the first and second class lever provide?
A screw and a spur gear.
Positive mechanical advantage.
The rope that passes through your hands is greater than the distance that the load is raised.
To speed up the motion of resistence.

39. What is the purpose of a third class lever?
The force used to overcome friction is greater than the force used to do useful work.
To speed up the motion of resistence.
Direction - speed or size of the force applied.
Magnify or reduce the force which you apply.

40. An egg beater has a mechanical advantage of what?
Less than 1.
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.
To magnify the applied force.

41. With a single fixed sheave what is the only mechanical advantage?
The change of the direction of the pull.
Length of ramp/length of height from floor to truck
Same.
Count the number of parts of the rope going to and from the movable block.

42. What is the jack screw used for?
Equals the weight of the object being hoisted.
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 raise a house or other heavy machinery.
your arm.

43. 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.
Same.
Simple machine
1

44. What is the formula for the wheel and axle?
Opposite.
Increase or decrease the the speed of the applied motion.
To raise a house or other heavy machinery.
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

45. How do you measure power?
To raise a house or other heavy machinery.
Feet.
In Horsepower.
45

46. What direction does the effort and resistance move in the second class levers?
Same.
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
A few thousandths of an inch.

47. What are the 4 forces?
Wheel and axle.
The rope that passes through your hands is greater than the distance that the load is raised.
The change of the direction of the pull.
Gravity - Magnetism - Friction - Recoil

48. What type of lever provides a fractional mechanical advantage?
Third class lever.
45
A few thousandths of an inch.
Increase or decrease the the speed of the applied motion.

49. What is another example of a wheel and axle?
Door knob.
Same.
Magnify or reduce the force which you apply.
1

50. Formula for fractional mechanical disadvantage.
Work=Force*Distance
In pounds.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
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.