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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 is force measured in work?
With oil - grease or soap.
In pounds.
1
Opposite.

2. What is the purpose of a third class lever?
2(pie)/pitch
fulcrum- weight- effort
To speed up the motion of resistence.
Door knob.

3. Work is measured in units also known as?
Foot- pounds
Positive mechanical advantage.
Work=Force*Distance
The rope that passes through your hands is greater than the distance that the load is raised.

4. Fractional mechanical advantage
Power=Work/Time
Mechanical disadvantage. Use more force than the force of the load you lift.
Work=Force*Distance
Wheel and axle.

5. What is the power formula?
Power=Work/Time
45
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Equals the weight of the object being hoisted.

6. What is the mechanical advantage for a single fixed block?
Magnify or reduce the force which you apply.
1
To raise a house or other heavy machinery.
Equals the weight of the object being hoisted.

7. What direction does the effort and resistance move in first class levers?
Count the number of parts of the rope going to and from the movable block.
Wheel and axle.
Opposite.
your arm.

8. Class two 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.
Two surfaces move against one another.
fulcrum- weight- effort
A few thousandths of an inch.

9. Formula for fractional mechanical disadvantage.
Gravity - Magnetism - Friction - Recoil
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Power=Work/Time

10. What direction does the effort and resistance move in the second class levers?
Length of ramp/length of height from floor to truck
Same.
A modification of an inclined plane.
Equals the weight of the object being hoisted.

11. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
The force used to overcome friction is greater than the force used to do useful work.
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.
A few thousandths of an inch.

12. What is the formula for the wheel and axle?
To speed up the motion of resistence.
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
When a resistance is overcome by a force acting through a measurable distance.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

13. 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?
Count the number of parts of the rope going to and from the movable block.
With oil - grease or soap.
2. Each half of the rope carries an equal amount of weight.
32/8 = 4

14. What is the ratio of any gear train?
2. Each half of the rope carries an equal amount of weight.
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
Equals the weight of the object being hoisted.

15. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Opposite.
Third class lever.
Equals the weight of the object being hoisted.
Door knob.

16. A miter gear connects what?
Direction - speed or size of the force applied.
Connects shafts having a 90 degree angle.
1
Length of ramp/length of height from floor to truck

17. What direction does the effort and resistance move in third class levers.
32/8 = 4
45
Two surfaces move against one another.
Same.

18. What is the work formula?
Mechanical disadvantage. Use more force than the force of the load you lift.
Work=Force*Distance
Count the number of parts of the rope going to and from the movable block.
45

19. What is an example of a third class lever?
To raise a house or other heavy machinery.
Mechanical disadvantage. Use more force than the force of the load you lift.
Gravity - Magnetism - Friction - Recoil
your arm.

20. 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.
2(pie)/pitch
Increase or decrease the the speed of the applied motion.
To speed up the motion of resistence.

21. How can you decrease friction on flat surfaces?
With oil - grease or soap.
Count the number of parts of the rope going to and from the movable 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
In pounds.

22. What is the third thing a gear can do?
Two surfaces move against one another.
Wheel and axle.
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.
Magnify or reduce the force which you apply.

23. What is the mechanical advantage of a single movable block?
A modification of an inclined plane.
45
Work=Force*Distance
2. Each half of the rope carries an equal amount of weight.

24. What are first and third class levers used for?
Third class lever.
To magnify the applied force.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Less than 1.

25. What is another example of a wheel and axle?
The change of the direction of the pull.
Positive mechanical advantage.
Door knob.
Direction - speed or size of the force applied.

26. What is the second thing a gear can do?
Increase or decrease the the speed of the applied motion.
Feet.
In pounds.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

27. The worm gear is a combination of what?
A screw and a spur gear.
When a resistance is overcome by a force acting through a measurable distance.
Equals the weight of the object being hoisted.
The force used to overcome friction is greater than the force used to do useful work.

28. What is another way to find the mechanical advantage of an inclined plane?
The rope that passes through your hands is greater than the distance that the load is raised.
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
2. Each half of the rope carries an equal amount of weight.

29. The bevel gear is used to connect 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
To speed up the motion of resistence.
Shafts lying at any given angle.
2(pie)/pitch

30. How do you find the mechanical advantage?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
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 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.

31. How is work done?
When a resistance is overcome by a force acting through a measurable distance.
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
2. Each half of the rope carries an equal amount of weight.
your arm.

32. How do you measure power?
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
In Horsepower.
The change of the direction of the pull.
Same.

33. Friction is involved when?
Two surfaces move against one another.
Length of ramp/length of height from floor to truck
fulcrum- weight- effort
The rope that passes through your hands is greater than the distance that the load is raised.

34. The threads of a screw are cut so?
Count the number of parts of the rope going to and from the movable block.
Less than 1.
When a resistance is overcome by a force acting through a measurable distance.
The force used to overcome friction is greater than the force used to do useful work.

35. hat is a screw?
32/8 = 4
Direction - speed or size of the force applied.
A modification of an inclined plane.
To raise a house or other heavy machinery.

36. How is distance measured in work?
Magnify or reduce the force which you apply.
45
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.
Feet.

37. What is the first thing a gear can do?
Can change the direction of motion.
Same.
Wheel and axle.
Equals the weight of the object being hoisted.

38. What type of lever provides a fractional mechanical advantage?
Simple machine
Feet.
Wheel and axle.
Third class lever.

39. What is the jack screw used for?
In Horsepower.
When a resistance is overcome by a force acting through a measurable distance.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
To raise a house or other heavy machinery.

40. Gears can do a job for you by changing what three things?
Direction - speed or size of the force applied.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven 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
A few thousandths of an inch.

41. With a single fixed sheave what is the only mechanical advantage?
The force used to overcome friction is greater than the force used to do useful work.
The change of the direction of the pull.
To speed up the motion of resistence.
Work=Force*Distance

42. What is one type of second class lever?
Wheel and axle.
Same.
Increase or decrease the the speed of the applied motion.
Third class lever.

43. What kind of machine is the inclined plane?
To raise a house or other heavy machinery.
The change of the direction of the pull.
With oil - grease or soap.
Simple machine

44. What is the theoretical mechanical advantage of any gear train?
Can change the direction of motion.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Gravity - Magnetism - Friction - Recoil
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

45. The miter gear faces are beveled at what angle?
Count the number of parts of the rope going to and from the movable block.
45
The rope that passes through your hands is greater than the distance that the load is raised.
In Horsepower.

46. What kind of mechanical advantage does the first and second class lever provide?
Connects shafts having a 90 degree angle.
Positive mechanical advantage.
Length of ramp/length of height from floor to truck
A few thousandths of an inch.

47. How can you figure out the mechanical advantage of most block and falls by glance?
Positive mechanical advantage.
A screw and a spur gear.
Count the number of parts of the rope going to and from the movable block.
45

48. What is the formula for the mechanical advantage of a screw?
Simple machine
To speed up the motion of resistence.
2(pie)/pitch
When a resistance is overcome by a force acting through a measurable distance.

49. What does a micrometer measure?
Wheel and axle.
2. Each half of the rope carries an equal amount of weight.
Shafts lying at any given angle.
A few thousandths of an inch.

50. An egg beater has a mechanical advantage of what?
Third class lever.
When a resistance is overcome by a force acting through a measurable distance.
Less than 1.
Positive mechanical advantage.