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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.
Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

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 are the 4 forces?
Opposite.
Wheel and axle.
Door knob.
Gravity - Magnetism - Friction - Recoil

2. Gears can do a job for you by changing what three things?
A screw and a spur gear.
Direction - speed or size of the force applied.
To magnify the applied force.
A few thousandths of an inch.

3. What are first and third class levers used for?
Increase or decrease the the speed of the applied motion.
Wheel and axle.
To magnify the applied force.
Same.

4. How can you decrease friction on flat surfaces?
With oil - grease or soap.
In Horsepower.
A few thousandths of an inch.
Can change the direction of motion.

5. What kind of machine is the inclined plane?
Less than 1.
Simple machine
Shafts lying at any given angle.
Can change the direction of motion.

6. 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.
Wheel and axle.
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.

7. 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?
Door knob.
32/8 = 4
Count the number of parts of the rope going to and from the movable block.
Feet.

8. An egg beater has a mechanical advantage of what?
Less than 1.
Feet.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
A few thousandths of an inch.

9. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
Connects shafts having a 90 degree angle.
The rope that passes through your hands is greater than the distance that the load is raised.
Wheel and axle.
32/8 = 4

10. What is the third thing a gear can do?
your arm.
Opposite.
Magnify or reduce the force which you apply.
Less than 1.

11. 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.
Two surfaces move against one another.
A modification of an inclined plane.
Equals the weight of the object being hoisted.

12. What is the jack screw used for?
Shafts lying at any given angle.
The force used to overcome friction is greater than the force used to do useful work.
In pounds.
To raise a house or other heavy machinery.

13. What kind of mechanical advantage does the first and second class lever provide?
Magnify or reduce the force which you apply.
With oil - grease or soap.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Positive mechanical advantage.

14. What is the lever formula?
Foot- pounds
The rope that passes through your hands is greater than the distance that the load is raised.
Third class lever.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

15. A miter gear connects what?
2. Each half of the rope carries an equal amount of weight.
32/8 = 4
When a resistance is overcome by a force acting through a measurable distance.
Connects shafts having a 90 degree angle.

16. How do you measure power?
Opposite.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
In Horsepower.
Count the number of parts of the rope going to and from the movable block.

17. What is the work formula?
Can change the direction of motion.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
1
Work=Force*Distance

18. What is the first thing a gear can do?
A few thousandths of an inch.
Direction - speed or size of the force applied.
2(pie)/pitch
Can change the direction of motion.

19. Class two lever
fulcrum- weight- effort
Same.
45
Positive mechanical advantage.

20. What is another way to find the mechanical advantage of an inclined plane?
Length of ramp/length of height from floor to truck
The change of the direction of the pull.
Equals the weight of the object being hoisted.
Same.

21. What is the power formula?
2. Each half of the rope carries an equal amount of weight.
45
Power=Work/Time
Length of ramp/length of height from floor to truck

22. What is the mechanical advantage for a single fixed block?
To raise a house or other heavy machinery.
1
To magnify the applied force.
fulcrum- weight- effort

23. How can you figure out the mechanical advantage of most block and falls by glance?
Door knob.
Count the number of parts of the rope going to and from the movable block.
Simple machine
Less than 1.

24. What is the purpose of a third class lever?
In pounds.
The rope that passes through your hands is greater than the distance that the load is raised.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
To speed up the motion of resistence.

25. What is one type of second class lever?
Equals the weight of the object being hoisted.
Length of ramp/length of height from floor to truck
Wheel and axle.
1

26. How is distance measured in work?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Feet.
A few thousandths of an inch.
1

27. hat is a screw?
fulcrum- weight- effort
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
A modification of an inclined plane.
Wheel and axle.

28. What direction does the effort and resistance move in first class levers?
Can change the direction of motion.
Opposite.
To magnify the applied force.
Gravity - Magnetism - Friction - Recoil

29. The worm gear is a combination of what?
In Horsepower.
fulcrum- weight- effort
A screw and a spur gear.
32/8 = 4

30. Friction is involved when?
Magnify or reduce the force which you apply.
Two surfaces move against one another.
1
Third class lever.

31. What is the ratio of any gear train?
Door knob.
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.
1

32. Work is measured in units also known as?
A few thousandths of an inch.
A modification of an inclined plane.
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.

33. Formula for fractional mechanical disadvantage.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Opposite.
When a resistance is overcome by a force acting through a measurable distance.
Mechanical disadvantage. Use more force than the force of the load you lift.

34. The bevel gear is used to connect what?
With oil - grease or soap.
Shafts lying at any given angle.
Count the number of parts of the rope going to and from the movable block.
32/8 = 4

35. What type of lever provides a fractional mechanical advantage?
A screw and a spur gear.
your arm.
Gravity - Magnetism - Friction - Recoil
Third class lever.

36. What is the formula for the wheel and axle?
To speed up the motion of resistence.
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.
45

37. What is the mechanical advantage of a single movable block?
Door knob.
In pounds.
2. Each half of the rope carries an equal amount of weight.
Same.

38. What is the second thing a gear can do?
Increase or decrease the the speed of the applied motion.
Gravity - Magnetism - Friction - Recoil
Length of ramp/length of height from floor to truck
In Horsepower.

39. 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.
Foot- pounds
Wheel and axle.
Increase or decrease the the speed of the applied motion.

40. The threads of a screw are cut so?
A few thousandths of an inch.
Door knob.
45
The force used to overcome friction is greater than the force used to do useful work.

41. What is an example of a third 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.
Mechanical disadvantage. Use more force than the force of the load you lift.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
your arm.

42. What is the formula for the mechanical advantage of a screw?
The force used to overcome friction is greater than the force used to do useful work.
A screw and a spur gear.
2(pie)/pitch
Feet.

43. With a single fixed sheave what is the only mechanical advantage?
Less than 1.
Count the number of parts of the rope going to and from the movable block.
The change of the direction of the pull.
A screw and a spur gear.

44. What does a micrometer measure?
Shafts lying at any given angle.
Magnify or reduce the force which you apply.
Simple machine
A few thousandths of an inch.

45. How is work done?
your arm.
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
When a resistance is overcome by a force acting through a measurable distance.
Magnify or reduce the force which you apply.

46. Fractional mechanical advantage
Positive mechanical advantage.
Door knob.
Mechanical disadvantage. Use more force than the force of the load you lift.
Third class lever.

47. What is another example of a wheel and axle?
To magnify the applied force.
Door knob.
The change of the direction of the pull.
Magnify or reduce the force which you apply.

48. What direction does the effort and resistance move in the second class levers?
Can change the direction of motion.
2. Each half of the rope carries an equal amount of weight.
With oil - grease or soap.
Same.

49. The miter gear faces are beveled at what angle?
Work=Force*Distance
45
Third class lever.
2. Each half of the rope carries an equal amount of weight.

50. What direction does the effort and resistance move in third class levers.
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
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Same.
Direction - speed or size of the force applied.