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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 measure power?
Gravity - Magnetism - Friction - Recoil
Connects shafts having a 90 degree angle.
In Horsepower.
In pounds.

2. What direction does the effort and resistance move in the second class levers?
Same.
To raise a house or other heavy machinery.
In pounds.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

3. What does a micrometer measure?
Foot- pounds
A few thousandths of an inch.
fulcrum- weight- effort
Mechanical disadvantage. Use more force than the force of the load you lift.

4. What is one type of second class lever?
Same.
To speed up the motion of resistence.
Wheel and axle.
The rope that passes through your hands is greater than the distance that the load is raised.

5. What is the first thing a gear can do?
Gravity - Magnetism - Friction - Recoil
Connects shafts having a 90 degree angle.
Third class lever.
Can change the direction of motion.

6. Work is measured in units also known as?
2(pie)/pitch
A modification of an inclined plane.
A screw and a spur gear.
Foot- pounds

7. What is another example of a wheel and axle?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Positive mechanical advantage.
your arm.
Door knob.

8. What is the theoretical mechanical advantage of any gear train?
Length of ramp/length of height from floor to truck
Feet.
Same.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

9. How can you figure out the mechanical advantage of most block and falls by glance?
When a resistance is overcome by a force acting through a measurable distance.
Count the number of parts of the rope going to and from the movable block.
Length of ramp/length of height from floor to truck
32/8 = 4

10. Formula for fractional mechanical disadvantage.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Can change the direction of motion.
1

11. What are first and third class levers used for?
1
Same.
When a resistance is overcome by a force acting through a measurable distance.
To magnify the applied force.

12. What is the work formula?
Door knob.
Foot- pounds
Feet.
Work=Force*Distance

13. Class two lever
fulcrum- weight- effort
To speed up the motion of resistence.
The change of the direction of the pull.
To magnify the applied force.

14. Gears can do a job for you by changing what three things?
When a resistance is overcome by a force acting through a measurable distance.
Direction - speed or size of the force applied.
Foot- pounds
2(pie)/pitch

15. hat is a screw?
32/8 = 4
A modification of an inclined plane.
The force used to overcome friction is greater than the force used to do useful work.
Third class lever.

16. What is an example of a third class lever?
In Horsepower.
Simple machine
your arm.
Third class lever.

17. 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
45
1
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

18. How is force measured in work?
Shafts lying at any given angle.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Direction - speed or size of the force applied.
In pounds.

19. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
Less than 1.
With oil - grease or soap.
The rope that passes through your hands is greater than the distance that the load is raised.
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

20. What is the second thing a gear can do?
Wheel and axle.
The force used to overcome friction is greater than the force used to do useful work.
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.
Increase or decrease the the speed of the applied motion.

21. What is the formula for the 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
Mechanical disadvantage. Use more force than the force of the load you lift.
A few thousandths of an inch.
Connects shafts having a 90 degree angle.

22. What is the mechanical advantage of a single movable block?
2. Each half of the rope carries an equal amount of weight.
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.
A modification of an inclined plane.

23. How is distance measured in work?
In Horsepower.
A few thousandths of an inch.
Feet.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

24. Friction is involved when?
With oil - grease or soap.
To raise a house or other heavy machinery.
Connects shafts having a 90 degree angle.
Two surfaces move against one another.

25. What direction does the effort and resistance move in first class levers?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
To magnify the applied force.
Opposite.
Two surfaces move against one another.

26. The threads of a screw are cut so?
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.
With oil - grease or soap.
Same.

27. The miter gear faces are beveled at what angle?
fulcrum- weight- effort
45
Direction - speed or size of the force applied.
2(pie)/pitch

28. What direction does the effort and resistance move in third class levers.
In pounds.
Power=Work/Time
Same.
To raise a house or other heavy machinery.

29. An egg beater has a mechanical advantage of what?
2(pie)/pitch
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.
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
Less than 1.

30. What is another way to find the mechanical advantage of an inclined plane?
A few thousandths of an inch.
When a resistance is overcome by a force acting through a measurable distance.
Length of ramp/length of height from floor to truck
Power=Work/Time

31. What kind of mechanical advantage does the first and second class lever provide?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
In Horsepower.
Positive mechanical advantage.
Opposite.

32. What is the mechanical advantage for a single fixed block?
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
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
A modification of an inclined plane.
1

33. A miter gear connects 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
Connects shafts having a 90 degree angle.
In pounds.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

34. What is the formula for the mechanical advantage of a screw?
Gravity - Magnetism - Friction - Recoil
your arm.
2(pie)/pitch
A modification of an inclined plane.

35. With a single fixed sheave what is the only mechanical advantage?
The change of the direction of the pull.
Third class lever.
Power=Work/Time
Count the number of parts of the rope going to and from the movable block.

36. What is the lever formula?
Third class lever.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
A modification of an inclined plane.
Same.

37. What is the third thing a gear can do?
In pounds.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Magnify or reduce the force which you apply.
Less than 1.

38. What are the 4 forces?
45
To magnify the applied force.
Gravity - Magnetism - Friction - Recoil
Positive mechanical advantage.

39. What is the purpose of a third class lever?
To speed up the motion of resistence.
Door knob.
Count the number of parts of the rope going to and from the movable block.
Power=Work/Time

40. How is work done?
Connects shafts having a 90 degree angle.
Gravity - Magnetism - Friction - Recoil
When a resistance is overcome by a force acting through a measurable distance.
32/8 = 4

41. The worm gear is a combination of what?
Less than 1.
Same.
A screw and a spur gear.
When a resistance is overcome by a force acting through a measurable distance.

42. How do you find the mechanical advantage?
To magnify the applied force.
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.
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.

43. What type of lever provides a fractional mechanical advantage?
To speed up the motion of resistence.
Direction - speed or size of the force applied.
Work=Force*Distance
Third class lever.

44. What kind of machine is the inclined plane?
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
Simple machine
Can change the direction of motion.
To speed up the motion of resistence.

45. How can you decrease friction on flat surfaces?
A few thousandths of an inch.
With oil - grease or soap.
Mechanical disadvantage. Use more force than the force of the load you lift.
32/8 = 4

46. What is the jack screw used for?
To raise a house or other heavy machinery.
Less than 1.
When a resistance is overcome by a force acting through a measurable distance.
Direction - speed or size of the force applied.

47. The bevel gear is used to connect what?
Mechanical disadvantage. Use more force than the force of the load you lift.
Work=Force*Distance
Increase or decrease the the speed of the applied motion.
Shafts lying at any given angle.

48. What is the power formula?
Power=Work/Time
The force used to overcome friction is greater than the force used to do useful work.
Magnify or reduce the force which you apply.
In Horsepower.

49. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
With oil - grease or soap.
Shafts lying at any given angle.
Direction - speed or size of the force applied.
Equals the weight of the object being hoisted.

50. Fractional mechanical advantage
2. Each half of the rope carries an equal amount of weight.
Magnify or reduce the force which you apply.
Two surfaces move against one another.
Mechanical disadvantage. Use more force than the force of the load you lift.