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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 is the mechanical advantage of a single movable block?
2. Each half of the rope carries an equal amount of weight.
Shafts lying at any given angle.
Same.
Gravity - Magnetism - Friction - Recoil

2. An egg beater has a mechanical advantage of what?
Less than 1.
To raise a house or other heavy machinery.
Third class lever.
Feet.

3. How is distance measured in work?
2(pie)/pitch
To magnify the applied force.
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

4. Gears can do a job for you by changing what three things?
Direction - speed or size of the force applied.
A few thousandths of an inch.
Positive mechanical advantage.
The force used to overcome friction is greater than the force used to do useful work.

5. How is work done?
When a resistance is overcome by a force acting through a measurable distance.
45
Less than 1.
Same.

6. What is the first thing a gear can do?
Magnify or reduce the force which you apply.
Can change the direction of motion.
Foot- pounds
Gravity - Magnetism - Friction - Recoil

7. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
Simple machine
your arm.
With oil - grease or soap.
The rope that passes through your hands is greater than the distance that the load is raised.

8. Class two lever
Simple machine
In pounds.
Mechanical disadvantage. Use more force than the force of the load you lift.
fulcrum- weight- effort

9. What is the mechanical advantage for a single fixed block?
Same.
Connects shafts having a 90 degree angle.
1
Direction - speed or size of the force applied.

10. What is one type of second class lever?
2(pie)/pitch
Mechanical disadvantage. Use more force than the force of the load you lift.
45
Wheel and axle.

11. What kind of mechanical advantage does the first and second class lever provide?
45
Same.
Positive mechanical advantage.
To magnify the applied force.

12. 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 raise a house or other heavy machinery.
To speed up the motion of resistence.
The rope that passes through your hands is greater than the distance that the load is raised.

13. What type of lever provides a fractional mechanical advantage?
Third class lever.
In Horsepower.
Wheel and axle.
To speed up the motion of resistence.

14. What is the theoretical mechanical advantage of any gear train?
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.
Feet.
When a resistance is overcome by a force acting through a measurable distance.

15. What is the formula for the wheel and axle?
A screw and a spur gear.
Simple machine
Mechanical disadvantage. Use more force than the force of the load you lift.
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

16. What is the power formula?
Count the number of parts of the rope going to and from the movable block.
Foot- pounds
Work=Force*Distance
Power=Work/Time

17. Work is measured in units also known as?
Foot- pounds
A screw and a spur gear.
1
45

18. Fractional mechanical advantage
Mechanical disadvantage. Use more force than the force of the load you lift.
your arm.
fulcrum- weight- effort
1

19. The threads of a screw are cut so?
Door knob.
Shafts lying at any given angle.
The force used to overcome friction is greater than the force used to do useful work.
Same.

20. The miter gear faces are beveled at what angle?
45
Equals the weight of the object being hoisted.
Power=Work/Time
1

21. A miter gear connects what?
To magnify the applied force.
Feet.
Foot- pounds
Connects shafts having a 90 degree angle.

22. What is another example of a wheel and axle?
Door knob.
Equals the weight of the object being hoisted.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
In pounds.

23. What kind of machine is the inclined plane?
Simple machine
Mechanical disadvantage. Use more force than the force of the load you lift.
Foot- pounds
Wheel and axle.

24. How can you decrease friction on flat surfaces?
2(pie)/pitch
To speed up the motion of resistence.
With oil - grease or soap.
1

25. What is the work formula?
Work=Force*Distance
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
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.

26. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
2. Each half of the rope carries an equal amount of weight.
Opposite.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Equals the weight of the object being hoisted.

27. What are first and third class levers used for?
To magnify the applied force.
The rope that passes through your hands is greater than the distance that the load is raised.
Power=Work/Time
The force used to overcome friction is greater than the force used to do useful work.

28. What does a micrometer measure?
Two surfaces move against one another.
Work=Force*Distance
A few thousandths of an inch.
Connects shafts having a 90 degree angle.

29. What is the formula for the mechanical advantage of a screw?
Connects shafts having a 90 degree angle.
Foot- pounds
A few thousandths of an inch.
2(pie)/pitch

30. What direction does the effort and resistance move in third class levers.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
To raise a house or other heavy machinery.
Connects shafts having a 90 degree angle.
Same.

31. What is the third thing a gear can do?
Magnify or reduce the force which you apply.
Two surfaces move against one another.
Positive mechanical advantage.
Shafts lying at any given angle.

32. Formula for fractional mechanical disadvantage.
45
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Opposite.
1

33. How is force measured in work?
Magnify or reduce the force which you apply.
Shafts lying at any given angle.
In pounds.
Power=Work/Time

34. What is the ratio of any gear train?
Direction - speed or size of the force applied.
Count the number of parts of the rope going to and from the movable block.
Power=Work/Time
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

35. What is an example of a third class lever?
Same.
Foot- pounds
your arm.
2. Each half of the rope carries an equal amount of weight.

36. How do you measure power?
2. Each half of the rope carries an equal amount of weight.
To speed up the motion of resistence.
In Horsepower.
The change of the direction of the pull.

37. What direction does the effort and resistance move in first class levers?
Two surfaces move against one another.
Opposite.
A few thousandths of an inch.
With oil - grease or soap.

38. What is the second thing a gear can do?
2(pie)/pitch
Foot- pounds
The rope that passes through your hands is greater than the distance that the load is raised.
Increase or decrease the the speed of the applied motion.

39. How do you find the mechanical advantage?
Wheel and axle.
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.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

40. What is the jack screw used for?
1
To raise a house or other heavy machinery.
your arm.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

41. 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
In pounds.
To raise a house or other heavy machinery.
Feet.

42. What is the lever formula?
Count the number of parts of the rope going to and from the movable block.
In Horsepower.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Shafts lying at any given angle.

43. What are the 4 forces?
In pounds.
To raise a house or other heavy machinery.
Gravity - Magnetism - Friction - Recoil
Third class lever.

44. What is another way to find the mechanical advantage of an inclined plane?
Same.
45
The rope that passes through your hands is greater than the distance that the load is raised.
Length of ramp/length of height from floor to truck

45. hat is a screw?
2. Each half of the rope carries an equal amount of weight.
Simple machine
A modification of an inclined plane.
In Horsepower.

46. With a single fixed sheave what is the only mechanical advantage?
The change of the direction of the pull.
Same.
Can change the direction of motion.
Count the number of parts of the rope going to and from the movable block.

47. How can you figure out the mechanical advantage of most block and falls by glance?
Simple machine
Shafts lying at any given angle.
Count the number of parts of the rope going to and from the movable block.
1

48. The worm gear is a combination of what?
Count the number of parts of the rope going to and from the movable block.
A screw and a spur gear.
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.
Gravity - Magnetism - Friction - Recoil

49. The bevel gear is used to connect what?
Wheel and axle.
Feet.
Can change the direction of motion.
Shafts lying at any given angle.

50. Friction is involved when?
To speed up the motion of resistence.
32/8 = 4
Two surfaces move against one another.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.