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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 power formula?
Power=Work/Time
Less than 1.
your arm.
Opposite.

2. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
To magnify the applied force.
The rope that passes through your hands is greater than the distance that the load is raised.
Shafts lying at any given angle.
45

3. What is one type of second class lever?
Wheel and axle.
To magnify the applied force.
Work=Force*Distance
Increase or decrease the the speed of the applied motion.

4. What is the first thing a gear can do?
Increase or decrease the the speed of the applied motion.
Can change the direction of motion.
Direction - speed or size of the force applied.
your arm.

5. What is an example of a third class lever?
The rope that passes through your hands is greater than the distance that the load is raised.
Two surfaces move against one another.
When a resistance is overcome by a force acting through a measurable distance.
your arm.

6. What is the ratio of any gear train?
The change of the direction of the pull.
Equals the weight of the object being hoisted.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
The force used to overcome friction is greater than the force used to do useful work.

7. Formula for fractional mechanical disadvantage.
your arm.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
The force used to overcome friction is greater than the force used to do useful work.
Wheel and axle.

8. What is the purpose of a third class lever?
With oil - grease or soap.
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.
Length of ramp/length of height from floor to truck

9. With a single fixed sheave what is the only mechanical advantage?
The change of the direction of the pull.
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
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.

10. hat is a screw?
Positive mechanical advantage.
A modification of an inclined plane.
your arm.
1

11. What is the mechanical advantage for a single fixed block?
In Horsepower.
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.
1

12. What is another example of a wheel and axle?
Gravity - Magnetism - Friction - Recoil
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
To speed up the motion of resistence.
Door knob.

13. How is work done?
fulcrum- weight- effort
With oil - grease or soap.
When a resistance is overcome by a force acting through a measurable distance.
Simple machine

14. What does a micrometer measure?
With oil - grease or soap.
A few thousandths of an inch.
Wheel and axle.
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

15. What is the jack screw used for?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Positive mechanical advantage.
Magnify or reduce the force which you apply.
To raise a house or other heavy machinery.

16. What kind of machine is the inclined plane?
A few thousandths of an inch.
Power=Work/Time
Direction - speed or size of the force applied.
Simple machine

17. A miter gear connects what?
Increase or decrease the the speed of the applied motion.
1
Direction - speed or size of the force applied.
Connects shafts having a 90 degree angle.

18. 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.
Connects shafts having a 90 degree angle.
Third class lever.
To raise a house or other heavy machinery.

19. The bevel gear is used to connect what?
The change of the direction of the pull.
Wheel and axle.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Shafts lying at any given angle.

20. Work is measured in units also known as?
Shafts lying at any given angle.
Foot- pounds
Equals the weight of the object being hoisted.
Gravity - Magnetism - Friction - Recoil

21. What is the third thing a gear can do?
A screw and a spur gear.
The force used to overcome friction is greater than the force used to do useful work.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Magnify or reduce the force which you apply.

22. How is force measured in work?
Work=Force*Distance
In pounds.
The change of the direction of the pull.
Opposite.

23. What direction does the effort and resistance move in third class levers.
Connects shafts having a 90 degree angle.
Equals the weight of the object being hoisted.
Same.
Power=Work/Time

24. Class two lever
Count the number of parts of the rope going to and from the movable block.
45
fulcrum- weight- effort
32/8 = 4

25. What is the mechanical advantage of a single movable block?
Same.
2. Each half of the rope carries an equal amount of weight.
Positive mechanical advantage.
1

26. 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.
A few thousandths of an inch.
2(pie)/pitch
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

27. An egg beater has a mechanical advantage of what?
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.
Less than 1.
Power=Work/Time

28. What kind of mechanical advantage does the first and second class lever provide?
Positive mechanical advantage.
fulcrum- weight- effort
In pounds.
Shafts lying at any given angle.

29. How do you find the mechanical advantage?
Can change the direction of motion.
A modification of an inclined plane.
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.
Two surfaces move against one another.

30. What is the lever formula?
The force used to overcome friction is greater than the force used to do useful work.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Third class lever.
Can change the direction of motion.

31. The miter gear faces are beveled at what angle?
45
Same.
2. Each half of the rope carries an equal amount of weight.
Wheel and axle.

32. What direction does the effort and resistance move in first class levers?
fulcrum- weight- effort
Count the number of parts of the rope going to and from the movable block.
Opposite.
Third class lever.

33. What is the second thing a gear can do?
With oil - grease or soap.
Increase or decrease the the speed of the applied motion.
Gravity - Magnetism - Friction - Recoil
Positive mechanical advantage.

34. The threads of a screw are cut so?
Gravity - Magnetism - Friction - Recoil
fulcrum- weight- effort
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.

35. Gears can do a job for you by changing what three things?
Same.
A screw and a spur gear.
Same.
Direction - speed or size of the force applied.

36. The worm gear is a combination of what?
A screw and a spur gear.
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
Length of ramp/length of height from floor to truck
Magnify or reduce the force which you apply.

37. How do you measure power?
Gravity - Magnetism - Friction - Recoil
In Horsepower.
A few thousandths of an inch.
The force used to overcome friction is greater than the force used to do useful work.

38. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Wheel and axle.
Magnify or reduce the force which you apply.
Opposite.
Equals the weight of the object being hoisted.

39. What are first and third class levers used for?
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
45
To magnify the applied force.
Can change the direction of motion.

40. How can you decrease friction on flat surfaces?
Positive mechanical advantage.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Two surfaces move against one another.
With oil - grease or soap.

41. What are the 4 forces?
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.
To magnify the applied force.
Gravity - Magnetism - Friction - Recoil

42. What type of lever provides a fractional mechanical advantage?
To speed up the motion of resistence.
Foot- pounds
45
Third class lever.

43. Fractional mechanical advantage
The change of the direction of the pull.
Mechanical disadvantage. Use more force than the force of the load you lift.
Opposite.
In pounds.

44. Friction is involved when?
Two surfaces move against one another.
The rope that passes through your hands is greater than the distance that the load is raised.
In Horsepower.
Foot- pounds

45. How is distance measured in work?
your arm.
Feet.
2(pie)/pitch
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

46. 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
Same.
Equals the weight of the object being hoisted.
Door knob.

47. What is the work formula?
Work=Force*Distance
Third class lever.
In pounds.
To raise a house or other heavy machinery.

48. What is the formula for the wheel and axle?
Gravity - Magnetism - Friction - Recoil
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
Feet.

49. What is the theoretical mechanical advantage of any gear train?
32/8 = 4
When a resistance is overcome by a force acting through a measurable distance.
To raise a house or other heavy machinery.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

50. What direction does the effort and resistance move in the second class levers?
32/8 = 4
Length of ramp/length of height from floor to truck
Same.
With oil - grease or soap.