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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 for a single fixed block?
A modification of an inclined plane.
Same.
To speed up the motion of resistence.
1

2. Work is measured in units also known as?
45
Foot- pounds
Equals the weight of the object being hoisted.
Count the number of parts of the rope going to and from the movable block.

3. How do you find the mechanical advantage?
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.
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 change of the direction of the pull.

4. What does a micrometer measure?
Increase or decrease the the speed of the applied motion.
To raise a house or other heavy machinery.
A few thousandths of an inch.
In pounds.

5. What is another example of a wheel and axle?
Work=Force*Distance
Door knob.
Opposite.
The force used to overcome friction is greater than the force used to do useful work.

6. hat is a screw?
Work=Force*Distance
A modification of an inclined plane.
2. Each half of the rope carries an equal amount of weight.
A screw and a spur gear.

7. Gears can do a job for you by changing what three things?
Door knob.
Direction - speed or size of the force applied.
Same.
A few thousandths of an inch.

8. What is an example of a third class lever?
your arm.
The force used to overcome friction is greater than the force used to do useful work.
Door knob.
Opposite.

9. What kind of mechanical advantage does the first and second class lever provide?
Magnify or reduce the force which you apply.
Same.
A screw and a spur gear.
Positive mechanical advantage.

10. What direction does the effort and resistance move in third class levers.
Same.
Opposite.
Foot- pounds
A modification of an inclined plane.

11. What is one type of second class lever?
Less than 1.
Wheel and axle.
32/8 = 4
Shafts lying at any given angle.

12. What is the power formula?
Door knob.
Magnify or reduce the force which you apply.
In pounds.
Power=Work/Time

13. What are first and third class levers used for?
To magnify the applied force.
32/8 = 4
Equals the weight of the object being hoisted.
To raise a house or other heavy machinery.

14. How can you decrease friction on flat surfaces?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Count the number of parts of the rope going to and from the movable block.
A screw and a spur gear.
With oil - grease or soap.

15. Fractional mechanical advantage
The force used to overcome friction is greater than the force used to do useful work.
Can change the direction of motion.
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. How can you figure out the mechanical advantage of most block and falls by glance?
Less than 1.
Count the number of parts of the rope going to and from the movable block.
A screw and a spur gear.
Direction - speed or size of the force applied.

17. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
To raise a house or other heavy machinery.
Equals the weight of the object being hoisted.
2(pie)/pitch
When a resistance is overcome by a force acting through a measurable distance.

18. A miter gear connects what?
Simple machine
The rope that passes through your hands is greater than the distance that the load is raised.
Same.
Connects shafts having a 90 degree angle.

19. What direction does the effort and resistance move in first class levers?
Power=Work/Time
Opposite.
Shafts lying at any given angle.
45

20. How do you measure power?
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.
In Horsepower.
Gravity - Magnetism - Friction - Recoil
Positive mechanical advantage.

21. What is the second thing a gear can do?
Magnify or reduce the force which you apply.
Direction - speed or size of the force applied.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Increase or decrease the the speed of the applied motion.

22. With a single fixed sheave what is the only mechanical advantage?
When a resistance is overcome by a force acting through a measurable distance.
Power=Work/Time
The change of the direction of the pull.
32/8 = 4

23. An egg beater has a mechanical advantage of what?
To speed up the motion of resistence.
A modification of an inclined plane.
Same.
Less than 1.

24. How is force measured in work?
A screw and a spur gear.
2. Each half of the rope carries an equal amount of weight.
Simple machine
In pounds.

25. How is work done?
A modification of an inclined plane.
When a resistance is overcome by a force acting through a measurable distance.
Positive mechanical advantage.
A screw and a spur gear.

26. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
Door knob.
The rope that passes through your hands is greater than the distance that the load is raised.
With oil - grease or soap.
A modification of an inclined plane.

27. What is the work formula?
Work=Force*Distance
The rope that passes through your hands is greater than the distance that the load is raised.
Mechanical disadvantage. Use more force than the force of the load you lift.
Third class lever.

28. What is the first thing a gear can do?
Direction - speed or size of the force applied.
The rope that passes through your hands is greater than the distance that the load is raised.
Shafts lying at any given angle.
Can change the direction of motion.

29. The threads of a screw are cut so?
Connects shafts having a 90 degree angle.
Count the number of parts of the rope going to and from the movable block.
The force used to overcome friction is greater than the force used to do useful work.
Shafts lying at any given angle.

30. Friction is involved when?
Foot- pounds
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.
Two surfaces move against one another.

31. What is the jack screw used for?
In pounds.
Opposite.
Power=Work/Time
To raise a house or other heavy machinery.

32. What direction does the effort and resistance move in the second class levers?
Increase or decrease the the speed of the applied motion.
Wheel and axle.
Same.
Opposite.

33. What is the formula for the wheel and axle?
Count the number of parts of the rope going to and from the movable block.
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
In pounds.

34. 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?
Foot- pounds
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
Gravity - Magnetism - Friction - Recoil
32/8 = 4

35. What is the mechanical advantage of a single movable block?
Direction - speed or size of the force applied.
Can change the direction of motion.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
2. Each half of the rope carries an equal amount of weight.

36. The worm gear is a combination of what?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Simple machine
A screw and a spur gear.
Two surfaces move against one another.

37. What kind of machine is the inclined plane?
Magnify or reduce the force which you apply.
To speed up the motion of resistence.
Simple machine
Same.

38. How is distance measured in work?
2. Each half of the rope carries an equal amount of weight.
1
Feet.
The change of the direction of the pull.

39. What is the ratio 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.
Third class lever.
Same.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

40. The miter gear faces are beveled at what angle?
Feet.
Same.
45
Count the number of parts of the rope going to and from the movable block.

41. What is another way to find the mechanical advantage of an inclined plane?
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
Equals the weight of the object being hoisted.
Magnify or reduce the force which you apply.

42. What type of lever provides a fractional mechanical advantage?
Wheel and axle.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Third class lever.
A few thousandths of an inch.

43. What is the formula for the mechanical advantage of a screw?
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
Same.
Work=Force*Distance
2(pie)/pitch

44. Class two lever
Wheel and axle.
Work=Force*Distance
fulcrum- weight- effort
Length of ramp/length of height from floor to truck

45. The bevel gear is used to connect what?
To speed up the motion of resistence.
Shafts lying at any given angle.
In pounds.
fulcrum- weight- effort

46. What is the purpose of a third class lever?
Work=Force*Distance
To speed up the motion of resistence.
2. Each half of the rope carries an equal amount of weight.
To raise a house or other heavy machinery.

47. What is the theoretical mechanical advantage of any gear train?
A screw and a spur gear.
Can change the direction of motion.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
The rope that passes through your hands is greater than the distance that the load is raised.

48. What is the third thing a gear can do?
2(pie)/pitch
1
Magnify or reduce the force which you apply.
A screw and a spur gear.

49. Formula for fractional mechanical disadvantage.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Connects shafts having a 90 degree angle.
Opposite.
Door knob.

50. What are the 4 forces?
Count the number of parts of the rope going to and from the movable block.
1
Same.
Gravity - Magnetism - Friction - Recoil