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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 an example of a third class lever?
your arm.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Positive mechanical advantage.
Shafts lying at any given angle.

2. What is one type of second class lever?
Same.
Wheel and axle.
The force used to overcome friction is greater than the force used to do useful work.
Mechanical disadvantage. Use more force than the force of the load you lift.

3. What kind of mechanical advantage does the first and second class lever provide?
To raise a house or other heavy machinery.
Shafts lying at any given angle.
In Horsepower.
Positive mechanical advantage.

4. What are first and third class levers used for?
To magnify the applied force.
Shafts lying at any given angle.
Work=Force*Distance
Power=Work/Time

5. What direction does the effort and resistance move in third class levers.
Same.
Foot- pounds
To speed up the motion of resistence.
Simple machine

6. A miter gear connects what?
Same.
The change of the direction of the pull.
Connects shafts having a 90 degree angle.
1

7. What is the jack screw used for?
Simple machine
To raise a house or other heavy machinery.
Same.
The force used to overcome friction is greater than the force used to do useful work.

8. What does a micrometer measure?
Connects shafts having a 90 degree angle.
Equals the weight of the object being hoisted.
A few thousandths of an inch.
Mechanical disadvantage. Use more force than the force of the load you lift.

9. The worm gear is a combination of what?
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
Wheel and axle.
A screw and a spur gear.
To magnify the applied force.

10. Work is measured in units also known as?
Gravity - Magnetism - Friction - Recoil
A screw and a spur gear.
Same.
Foot- pounds

11. Fractional mechanical advantage
Mechanical disadvantage. Use more force than the force of the load you lift.
Connects shafts having a 90 degree angle.
your arm.
Positive mechanical advantage.

12. What is another example of a wheel and axle?
Feet.
Increase or decrease the the speed of the applied motion.
Door knob.
Foot- pounds

13. What is the third thing a gear can do?
2. Each half of the rope carries an equal amount of weight.
Same.
Mechanical disadvantage. Use more force than the force of the load you lift.
Magnify or reduce the force which you apply.

14. The miter gear faces are beveled at what angle?
Shafts lying at any given angle.
With oil - grease or soap.
A modification of an inclined plane.
45

15. How is distance measured in work?
Third class lever.
Length of ramp/length of height from floor to truck
Feet.
When a resistance is overcome by a force acting through a measurable distance.

16. An egg beater has a mechanical advantage of what?
The change of the direction of the pull.
Positive mechanical advantage.
Less than 1.
Third class lever.

17. How do you find the mechanical advantage?
1
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven 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.
With oil - grease or soap.

18. What is the mechanical advantage for a single fixed block?
With oil - grease or soap.
1
Gravity - Magnetism - Friction - Recoil
In pounds.

19. Formula for fractional mechanical disadvantage.
Increase or decrease the the speed of the applied motion.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
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.

20. The bevel gear is used to connect what?
Length of ramp/length of height from floor to truck
Shafts lying at any given angle.
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.
Work=Force*Distance

21. 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?
Gravity - Magnetism - Friction - Recoil
Power=Work/Time
32/8 = 4
Third class lever.

22. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Equals the weight of the object being hoisted.
Positive mechanical advantage.
Connects shafts having a 90 degree angle.
With oil - grease or soap.

23. How can you figure out the mechanical advantage of most block and falls by glance?
The rope that passes through your hands is greater than the distance that the load is raised.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Count the number of parts of the rope going to and from the movable block.
Gravity - Magnetism - Friction - Recoil

24. What is the first thing a gear can do?
Can change the direction of motion.
Wheel and axle.
Magnify or reduce the force which you apply.
fulcrum- weight- effort

25. What kind of machine is the inclined plane?
Simple machine
Door knob.
Length of ramp/length of height from floor to truck
With oil - grease or soap.

26. What is the formula for the mechanical advantage of a screw?
When a resistance is overcome by a force acting through a measurable distance.
A few thousandths of an inch.
2(pie)/pitch
2. Each half of the rope carries an equal amount of weight.

27. With a single fixed sheave what is the only mechanical advantage?
Same.
32/8 = 4
Power=Work/Time
The change of the direction of the pull.

28. What direction does the effort and resistance move in the second class levers?
Same.
With oil - grease or soap.
2(pie)/pitch
Connects shafts having a 90 degree angle.

29. What is another way to find the mechanical advantage of an inclined plane?
Power=Work/Time
Length of ramp/length of height from floor to truck
your arm.
Shafts lying at any given angle.

30. The threads of a screw are cut so?
The force used to overcome friction is greater than the force used to do useful work.
1
Power=Work/Time
The rope that passes through your hands is greater than the distance that the load is raised.

31. How do you measure power?
In Horsepower.
Gravity - Magnetism - Friction - Recoil
With oil - grease or soap.
Same.

32. Friction is involved when?
Same.
Two surfaces move against one another.
Mechanical disadvantage. Use more force than the force of the load you lift.
Can change the direction of motion.

33. What are the 4 forces?
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
Count the number of parts of the rope going to and from the movable block.
To raise a house or other heavy machinery.
Gravity - Magnetism - Friction - Recoil

34. What is the mechanical advantage of a single movable block?
2. Each half of the rope carries an equal amount of weight.
To magnify the applied force.
The force used to overcome friction is greater than the force used to do useful work.
Less than 1.

35. What is the lever formula?
Power=Work/Time
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Count the number of parts of the rope going to and from the movable block.
Foot- pounds

36. How is force measured in work?
A modification of an inclined plane.
Wheel and axle.
Gravity - Magnetism - Friction - Recoil
In pounds.

37. Class two lever
fulcrum- weight- effort
To speed up the motion of resistence.
Connects shafts having a 90 degree angle.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

38. How can you decrease friction on flat surfaces?
With oil - grease or soap.
Magnify or reduce the force which you apply.
Two surfaces move against one another.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

39. What is the work formula?
Shafts lying at any given angle.
To raise a house or other heavy machinery.
2(pie)/pitch
Work=Force*Distance

40. Gears can do a job for you by changing what three things?
Shafts lying at any given angle.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Direction - speed or size of the force applied.
Length of ramp/length of height from floor to truck

41. What is the formula for the wheel and axle?
Foot- pounds
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
Power=Work/Time

42. What type of lever provides a fractional mechanical advantage?
Increase or decrease the the speed of the applied motion.
In Horsepower.
Third class lever.
Positive mechanical advantage.

43. What is the ratio of any gear train?
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
To raise a house or other heavy machinery.
2. Each half of the rope carries an equal amount of weight.
2(pie)/pitch

44. How is work done?
When a resistance is overcome by a force acting through a measurable distance.
Opposite.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Can change the direction of motion.

45. What is the theoretical mechanical advantage of any gear train?
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.
1
Gravity - Magnetism - Friction - Recoil

46. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
The rope that passes through your hands is greater than the distance that the load is raised.
2. Each half of the rope carries an equal amount of weight.
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.

47. What is the power formula?
Less than 1.
Wheel and axle.
Power=Work/Time
Feet.

48. What direction does the effort and resistance move in first class levers?
your arm.
Opposite.
Power=Work/Time
When a resistance is overcome by a force acting through a measurable distance.

49. hat is a screw?
A modification of an inclined plane.
1
A screw and a spur gear.
To raise a house or other heavy machinery.

50. What is the second thing a gear can do?
Increase or decrease the the speed of the applied motion.
fulcrum- weight- effort
Opposite.
Two surfaces move against one another.