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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. How do you find the mechanical advantage?
Gravity - Magnetism - Friction - Recoil
1
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.

2. Fractional mechanical advantage
45
your arm.
Mechanical disadvantage. Use more force than the force of the load you lift.
Opposite.

3. 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.
Equals the weight of the object being hoisted.
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.

4. What is one type of second class lever?
The rope that passes through your hands is greater than the distance that the load is raised.
Connects shafts having a 90 degree angle.
With oil - grease or soap.
Wheel and axle.

5. What is the third thing a gear can do?
Mechanical disadvantage. Use more force than the force of the load you lift.
2. Each half of the rope carries an equal amount of weight.
Magnify or reduce the force which you apply.
Count the number of parts of the rope going to and from the movable block.

6. What direction does the effort and resistance move in first class levers?
A few thousandths of an inch.
Opposite.
Magnify or reduce the force which you apply.
Two surfaces move against one another.

7. How do you measure power?
In Horsepower.
Door knob.
Count the number of parts of the rope going to and from the movable block.
Connects shafts having a 90 degree angle.

8. What are the 4 forces?
fulcrum- weight- effort
Gravity - Magnetism - Friction - Recoil
Third class lever.
Mechanical disadvantage. Use more force than the force of the load you lift.

9. With a single fixed sheave what is the only mechanical advantage?
Power=Work/Time
fulcrum- weight- effort
The change of the direction of the pull.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

10. The miter gear faces are beveled at what angle?
32/8 = 4
Opposite.
45
The change of the direction of the pull.

11. Class two lever
your arm.
In pounds.
Connects shafts having a 90 degree angle.
fulcrum- weight- effort

12. 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.
Foot- pounds
Can change the direction of motion.
To speed up the motion of resistence.

13. What is the jack screw used for?
Third class lever.
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.
To raise a house or other heavy machinery.

14. What is the formula for the mechanical advantage of a screw?
2(pie)/pitch
Work=Force*Distance
In pounds.
Positive mechanical advantage.

15. The bevel gear is used to connect what?
32/8 = 4
Shafts lying at any given angle.
Connects shafts having a 90 degree angle.
your arm.

16. What is the work formula?
Work=Force*Distance
Wheel and axle.
Equals the weight of the object being hoisted.
To raise a house or other heavy machinery.

17. What kind of machine is the inclined plane?
Feet.
With oil - grease or soap.
Simple machine
The change of the direction of the pull.

18. An egg beater has a mechanical advantage of what?
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.
your arm.
Less than 1.

19. The threads of a screw are cut so?
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 force used to overcome friction is greater than the force used to do useful work.
Length of ramp/length of height from floor to truck

20. What is an example of a third class lever?
your arm.
A modification of an inclined plane.
Mechanical disadvantage. Use more force than the force of the load you lift.
Third class lever.

21. How is distance measured in work?
Feet.
In Horsepower.
Positive mechanical advantage.
Foot- pounds

22. What direction does the effort and resistance move in the second class levers?
Same.
Door knob.
In pounds.
A screw and a spur gear.

23. A miter gear connects what?
Connects shafts having a 90 degree angle.
To speed up the motion of resistence.
Simple machine
A few thousandths of an inch.

24. 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.
Mechanical disadvantage. Use more force than the force of the load you lift.
Work=Force*Distance
A modification of an inclined plane.

25. Formula for fractional mechanical disadvantage.
Work=Force*Distance
2. Each half of the rope carries an equal amount of weight.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
With oil - grease or soap.

26. What direction does the effort and resistance move in third class levers.
Same.
Equals the weight of the object being hoisted.
Wheel and axle.
Positive mechanical advantage.

27. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
1
your arm.
Equals the weight of the object being hoisted.
Gravity - Magnetism - Friction - Recoil

28. Friction is involved when?
Simple machine
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.
32/8 = 4

29. What are first and third class levers used for?
To magnify the applied force.
fulcrum- weight- effort
Mechanical disadvantage. Use more force than the force of the load you lift.
To raise a house or other heavy machinery.

30. hat is a screw?
32/8 = 4
A modification of an inclined plane.
Simple machine
Opposite.

31. What is the second thing a gear can do?
Increase or decrease the the speed of the applied 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 force used to overcome friction is greater than the force used to do useful work.
Door knob.

32. Gears can do a job for you by changing what three things?
Direction - speed or size of the force applied.
1
In Horsepower.
Increase or decrease the the speed of the applied motion.

33. How is force measured in work?
your arm.
Count the number of parts of the rope going to and from the movable block.
fulcrum- weight- effort
In pounds.

34. What is the first thing a gear can do?
Length of ramp/length of height from floor to truck
Power=Work/Time
Can change the direction of motion.
Third class lever.

35. How can you decrease friction on flat surfaces?
With oil - grease or soap.
Simple machine
A screw and a spur gear.
To raise a house or other heavy machinery.

36. 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.
Less than 1.
The rope that passes through your hands is greater than the distance that the load is raised.
Door knob.

37. What is another example of a wheel and axle?
Door knob.
Increase or decrease the the speed of the applied motion.
Two surfaces move against one another.
The change of the direction of the pull.

38. What type of lever provides a fractional 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.
Feet.
The force used to overcome friction is greater than the force used to do useful work.
Third class lever.

39. What is the mechanical advantage for a single fixed block?
Same.
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
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.

40. 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?
In pounds.
Same.
Two surfaces move against one another.
32/8 = 4

41. What is the power formula?
Power=Work/Time
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.
Less than 1.

42. How can you figure out the mechanical advantage of most block and falls by glance?
A screw and a spur gear.
Door knob.
Direction - speed or size of the force applied.
Count the number of parts of the rope going to and from the movable block.

43. What is the formula for the wheel and axle?
2(pie)/pitch
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
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Work=Force*Distance

44. What does a micrometer measure?
A few thousandths of an inch.
Equals the weight of the object being hoisted.
Opposite.
Less than 1.

45. What is the mechanical advantage of a single movable block?
Wheel and axle.
Can change the direction of motion.
Shafts lying at any given angle.
2. Each half of the rope carries an equal amount of weight.

46. The worm gear is a combination of what?
A screw and a spur gear.
Less than 1.
Count the number of parts of the rope going to and from the movable block.
A few thousandths of an inch.

47. What is the purpose of a third class lever?
Feet.
Can change the direction of motion.
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.

48. Work is measured in units also known as?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Simple machine
Wheel and axle.
Foot- pounds

49. What kind of mechanical advantage does the first and second class lever provide?
Positive mechanical advantage.
When a resistance is overcome by a force acting through a measurable distance.
To raise a house or other heavy machinery.
1

50. What is another way to find the mechanical advantage of an inclined plane?
To magnify the applied force.
Opposite.
The force used to overcome friction is greater than the force used to do useful work.
Length of ramp/length of height from floor to truck