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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 type of lever provides a fractional mechanical advantage?
32/8 = 4
Magnify or reduce the force which you apply.
In Horsepower.
Third class lever.

2. What direction does the effort and resistance move in the second class levers?
Increase or decrease the the speed of the applied motion.
Door knob.
Same.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

3. Friction is involved when?
Opposite.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
2(pie)/pitch
Two surfaces move against one another.

4. What is the formula for the wheel and axle?
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Mechanical disadvantage. Use more force than the force of the load you lift.
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

5. Fractional mechanical advantage
Mechanical disadvantage. Use more force than the force of the load you lift.
To speed up the motion of resistence.
Length of ramp/length of height from floor to truck
Equals the weight of the object being hoisted.

6. 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.
A modification of an inclined plane.
Direction - speed or size of the force applied.
1

7. What is an example of a third class lever?
your arm.
Simple machine
When a resistance is overcome by a force acting through a measurable distance.
Power=Work/Time

8. The threads of a screw are cut so?
The force used to overcome friction is greater than the force used to do useful work.
32/8 = 4
Same.
your arm.

9. 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
Magnify or reduce the force which you apply.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
45

10. What is the formula for the mechanical advantage of a screw?
2(pie)/pitch
Same.
Foot- pounds
Feet.

11. The miter gear faces are beveled at what angle?
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
Magnify or reduce the force which you apply.
A few thousandths of an inch.
45

12. What direction does the effort and resistance move in first class levers?
Opposite.
Positive mechanical advantage.
A few thousandths of an inch.
Length of ramp/length of height from floor to truck

13. The worm gear is a combination of what?
When a resistance is overcome by a force acting through a measurable distance.
Opposite.
A screw and a spur gear.
Gravity - Magnetism - Friction - Recoil

14. What is the ratio of any gear train?
your arm.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Feet.
Wheel and axle.

15. How is work done?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
In pounds.
When a resistance is overcome by a force acting through a measurable distance.
2(pie)/pitch

16. Work is measured in units also known as?
Connects shafts having a 90 degree angle.
In pounds.
your arm.
Foot- pounds

17. What is the jack screw used for?
your arm.
To raise a house or other heavy machinery.
To speed up the motion of resistence.
Magnify or reduce the force which you apply.

18. What direction does the effort and resistance move in third class levers.
Length of ramp/length of height from floor to truck
Shafts lying at any given angle.
In pounds.
Same.

19. What is the third thing a gear can do?
Magnify or reduce the force which you apply.
Increase or decrease the the speed of the applied motion.
To speed up the motion of resistence.
45

20. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
Foot- pounds
The rope that passes through your hands is greater than the distance that the load is raised.
45
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

21. What is the mechanical advantage of a single movable block?
1
The change of the direction of the pull.
2. Each half of the rope carries an equal amount of weight.
Same.

22. What is the mechanical advantage for a single fixed block?
Foot- pounds
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.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

23. What is another example of a wheel and axle?
Same.
Door knob.
To raise a house or other heavy machinery.
To speed up the motion of resistence.

24. How do you find the mechanical advantage?
fulcrum- weight- effort
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.
A screw and a spur gear.
To magnify the applied force.

25. 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.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Equals the weight of the object being hoisted.
The rope that passes through your hands is greater than the distance that the load is raised.

26. How is force measured in work?
A modification of an inclined plane.
In pounds.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Length of ramp/length of height from floor to truck

27. hat is a screw?
2(pie)/pitch
A few thousandths of an inch.
A modification of an inclined plane.
45

28. How can you figure out the mechanical advantage of most block and falls by glance?
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 force used to overcome friction is greater than the force used to do useful work.
Count the number of parts of the rope going to and from the movable block.

29. With a single fixed sheave what is the only mechanical advantage?
Increase or decrease the the speed of the applied motion.
Two surfaces move against one another.
Shafts lying at any given angle.
The change of the direction of the pull.

30. How is distance measured in work?
45
Work=Force*Distance
Mechanical disadvantage. Use more force than the force of the load you lift.
Feet.

31. What is the second thing a gear can do?
A few thousandths of an inch.
Length of ramp/length of height from floor to truck
Less than 1.
Increase or decrease the the speed of the applied motion.

32. A miter gear connects what?
Connects shafts having a 90 degree angle.
Count the number of parts of the rope going to and from the movable block.
Can change the direction of motion.
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.

33. An egg beater has a mechanical advantage of what?
Less than 1.
fulcrum- weight- effort
Connects shafts having a 90 degree angle.
Opposite.

34. What are the 4 forces?
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Gravity - Magnetism - Friction - Recoil
To magnify the applied force.
Magnify or reduce the force which you apply.

35. What does a micrometer measure?
With oil - grease or soap.
A few thousandths of an inch.
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.

36. Formula for fractional mechanical disadvantage.
Can change the direction of motion.
Gravity - Magnetism - Friction - Recoil
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Third class lever.

37. What kind of mechanical advantage does the first and second class lever provide?
Positive mechanical advantage.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Shafts lying at any given angle.
Opposite.

38. What kind of machine is the inclined plane?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Less than 1.
Simple machine
32/8 = 4

39. What is another way to find the mechanical advantage of an inclined plane?
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.
Length of ramp/length of height from floor to truck
In pounds.

40. What is the power formula?
Magnify or reduce the force which you apply.
With oil - grease or soap.
Power=Work/Time
Work=Force*Distance

41. How can you decrease friction on flat surfaces?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Power=Work/Time
With oil - grease or soap.
fulcrum- weight- effort

42. How do you measure power?
Power=Work/Time
In Horsepower.
Magnify or reduce the force which you apply.
With oil - grease or soap.

43. What is the purpose of a third class lever?
To speed up the motion of resistence.
Magnify or reduce the force which you apply.
Less than 1.
Length of ramp/length of height from floor to truck

44. What is the first thing a gear can do?
45
Simple machine
The change of the direction of the pull.
Can change the direction of motion.

45. Gears can do a job for you by changing what three things?
Direction - speed or size of the force applied.
Shafts lying at any given angle.
45
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

46. 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.
With oil - grease or soap.
Opposite.
To raise a house or other heavy machinery.

47. What is one type of second class lever?
Same.
Wheel and axle.
To magnify the applied force.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

48. Class two lever
Less than 1.
fulcrum- weight- effort
32/8 = 4
Opposite.

49. What are first and third class levers used for?
To magnify the applied force.
Opposite.
Third class lever.
When a resistance is overcome by a force acting through a measurable distance.

50. The bevel gear is used to connect what?
Shafts lying at any given angle.
Count the number of parts of the rope going to and from the movable block.
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