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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. 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?
To speed up the motion of resistence.
The rope that passes through your hands is greater than the distance that the load is raised.
45
32/8 = 4

2. What is the theoretical mechanical advantage of any gear train?
A screw and a spur gear.
your arm.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Increase or decrease the the speed of the applied motion.

3. How is force measured in work?
Increase or decrease the the speed of the applied motion.
Gravity - Magnetism - Friction - Recoil
In pounds.
1

4. What is the third thing a gear can do?
1
Magnify or reduce the force which you apply.
In pounds.
fulcrum- weight- effort

5. Work is measured in units also known as?
To raise a house or other heavy machinery.
Foot- pounds
Opposite.
Mechanical disadvantage. Use more force than the force of the load you lift.

6. Fractional mechanical advantage
your arm.
Magnify or reduce the force which you apply.
Equals the weight of the object being hoisted.
Mechanical disadvantage. Use more force than the force of the load you lift.

7. What is the first thing a gear can do?
45
The change of the direction of the pull.
Can change the direction of motion.
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.

8. What is the work formula?
Work=Force*Distance
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.
Less than 1.

9. What is another example of a wheel and axle?
Door knob.
fulcrum- weight- effort
In pounds.
Less than 1.

10. The bevel gear is used to connect what?
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Shafts lying at any given angle.
Same.
Wheel and axle.

11. What is the ratio of any gear train?
fulcrum- weight- effort
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.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

12. With a single fixed sheave what is the only mechanical advantage?
The change of the direction of the pull.
Opposite.
Magnify or reduce the force which you apply.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

13. How do you find the mechanical advantage?
Opposite.
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.
Connects shafts having a 90 degree angle.
Direction - speed or size of the force applied.

14. Class two lever
Power=Work/Time
Wheel and axle.
Door knob.
fulcrum- weight- effort

15. What is the mechanical advantage for a single fixed block?
1
A modification of an inclined plane.
To speed up the motion of resistence.
The rope that passes through your hands is greater than the distance that the load is raised.

16. How can you decrease friction on flat surfaces?
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
With oil - grease or soap.
45
1

17. Friction is involved when?
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
2(pie)/pitch
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Two surfaces move against one another.

18. What is the mechanical advantage of a single movable block?
2. Each half of the rope carries an equal amount of weight.
To raise a house or other heavy machinery.
A few thousandths of an inch.
Work=Force*Distance

19. What is the formula for the mechanical advantage of a screw?
Connects shafts having a 90 degree angle.
A few thousandths of an inch.
Power=Work/Time
2(pie)/pitch

20. Gears can do a job for you by changing what three things?
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.
Direction - speed or size of the force applied.
32/8 = 4

21. What is another way to find the mechanical advantage of an inclined plane?
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
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Shafts lying at any given angle.

22. How can you figure out the mechanical advantage of most block and falls by glance?
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.
With oil - grease or soap.
Count the number of parts of the rope going to and from the movable block.

23. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
To raise a house or other heavy machinery.
Length of ramp/length of height from floor to truck
2. Each half of the rope carries an equal amount of weight.
Equals the weight of the object being hoisted.

24. What is an example of a third class lever?
your arm.
Count the number of parts of the rope going to and from the movable block.
Two surfaces move against one another.
Same.

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

26. What is the second thing a gear can do?
When a resistance is overcome by a force acting through a measurable distance.
Increase or decrease the the speed of the applied motion.
1
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

27. What are first and third class levers used for?
In pounds.
Feet.
To magnify the applied force.
Increase or decrease the the speed of the applied motion.

28. The miter gear faces are beveled at what angle?
Magnify or reduce the force which you apply.
45
When a resistance is overcome by a force acting through a measurable distance.
The change of the direction of the pull.

29. Formula for fractional mechanical disadvantage.
With oil - grease or soap.
1
Gravity - Magnetism - Friction - Recoil
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

30. The worm gear is a combination of what?
A screw and a spur gear.
Two surfaces move against one another.
Magnify or reduce the force which you apply.
The rope that passes through your hands is greater than the distance that the load is raised.

31. What does a micrometer measure?
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.
A few thousandths of an inch.
1

32. What is the purpose of a third class lever?
To speed up the motion of resistence.
Feet.
Same.
45

33. What kind of machine is the inclined plane?
A modification of an inclined plane.
Simple machine
Wheel and axle.
Gravity - Magnetism - Friction - Recoil

34. A miter gear connects what?
Count the number of parts of the rope going to and from the movable block.
Magnify or reduce the force which you apply.
Increase or decrease the the speed of the applied motion.
Connects shafts having a 90 degree angle.

35. What direction does the effort and resistance move in the second class levers?
1
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Direction - speed or size of the force applied.
Same.

36. How is work done?
A screw and a spur gear.
When a resistance is overcome by a force acting through a measurable distance.
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.

37. What are the 4 forces?
Foot- pounds
Direction - speed or size of the force applied.
A few thousandths of an inch.
Gravity - Magnetism - Friction - Recoil

38. What type of lever provides a fractional mechanical advantage?
2. Each half of the rope carries an equal amount of weight.
Magnify or reduce the force which you apply.
Third class lever.
1

39. What direction does the effort and resistance move in third class levers.
Length of ramp/length of height from floor to truck
Same.
Power=Work/Time
Work=Force*Distance

40. How do you measure power?
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
In Horsepower.
45

41. What is the power formula?
Increase or decrease the the speed of the applied motion.
A modification of an inclined plane.
Same.
Power=Work/Time

42. 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
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.
To raise a house or other heavy machinery.

43. What direction does the effort and resistance move in first class levers?
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.
Opposite.
Less than 1.
The rope that passes through your hands is greater than the distance that the load is raised.

44. An egg beater has a mechanical advantage of what?
Can change the direction of motion.
Power=Work/Time
Less than 1.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

45. What is the lever formula?
Two surfaces move against one another.
Opposite.
Count the number of parts of the rope going to and from the movable block.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

46. What is one type of second class lever?
Same.
To magnify the applied force.
Wheel and axle.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.

47. The threads of a screw are cut so?
The force used to overcome friction is greater than the force used to do useful work.
To raise a house or other heavy machinery.
The change of the direction of the pull.
Magnify or reduce the force which you apply.

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

49. What kind of mechanical advantage does the first and second class lever provide?
Positive mechanical advantage.
Magnify or reduce the force which you apply.
Count the number of parts of the rope going to and from the movable block.
When a resistance is overcome by a force acting through a measurable distance.

50. What is the jack screw used for?
Positive mechanical advantage.
Equals the weight of the object being hoisted.
To raise a house or other heavy machinery.
1