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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.
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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. Formula for fractional mechanical disadvantage.
Third class lever.
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.
Power=Work/Time

2. What direction does the effort and resistance move in third class levers.
A screw and a spur gear.
fulcrum- weight- effort
Same.
Work=Force*Distance

3. 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.
Shafts lying at any given angle.
fulcrum- weight- effort
2. Each half of the rope carries an equal amount of weight.

4. What is the lever formula?
Simple machine
Connects shafts having a 90 degree angle.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.

5. 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
In pounds.
fulcrum- weight- effort
Opposite.

6. What kind of mechanical advantage does the first and second class lever provide?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Same.
fulcrum- weight- effort
Positive mechanical advantage.

7. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Mechanical disadvantage. Use more force than the force of the load you lift.
Equals the weight of the object being hoisted.
Count the number of parts of the rope going to and from the movable block.
Increase or decrease the the speed of the applied motion.

8. The bevel gear is used to connect what?
Length of ramp/length of height from floor to truck
When a resistance is overcome by a force acting through a measurable distance.
Shafts lying at any given angle.
your arm.

9. Fractional mechanical advantage
Door knob.
your arm.
Mechanical disadvantage. Use more force than the force of the load you lift.
To magnify the applied force.

10. How is work done?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
When a resistance is overcome by a force acting through a measurable distance.
Foot- pounds
Door knob.

11. Work is measured in units also known as?
With oil - grease or soap.
Can change the direction of motion.
Length of ramp/length of height from floor to truck
Foot- pounds

12. What direction does the effort and resistance move in first class levers?
Opposite.
Wheel and axle.
Same.
Less than 1.

13. What is an example of a third class lever?
Same.
your arm.
Wheel and axle.
To magnify the applied force.

14. Friction is involved when?
Gravity - Magnetism - Friction - Recoil
Two surfaces move against one another.
Can change the direction of motion.
In Horsepower.

15. What is another example of a wheel and axle?
Less than 1.
Door knob.
2(pie)/pitch
The change of the direction of the pull.

16. What is the formula for the mechanical advantage of a screw?
2(pie)/pitch
32/8 = 4
Magnify or reduce the force which you apply.
Same.

17. What does a micrometer measure?
Gravity - Magnetism - Friction - Recoil
Connects shafts having a 90 degree angle.
A few thousandths of an inch.
Third class lever.

18. What is the mechanical advantage for a single fixed block?
Mechanical disadvantage. Use more force than the force of the load you lift.
1
Length of ramp/length of height from floor to truck
your arm.

19. What is the purpose of a third class lever?
Same.
To raise a house or other heavy machinery.
To speed up the motion of resistence.
Positive mechanical advantage.

20. How can you figure out the mechanical advantage of most block and falls by glance?
Same.
Power=Work/Time
2(pie)/pitch
Count the number of parts of the rope going to and from the movable block.

21. What are first and third class levers used for?
Same.
To magnify the applied force.
A screw and a spur gear.
The force used to overcome friction is greater than the force used to do useful work.

22. What is the jack screw used for?
fulcrum- weight- effort
The rope that passes through your hands is greater than the distance that the load is raised.
To raise a house or other heavy machinery.
A modification of an inclined plane.

23. What are the 4 forces?
When a resistance is overcome by a force acting through a measurable distance.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
2(pie)/pitch
Gravity - Magnetism - Friction - Recoil

24. How do you measure power?
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.
In Horsepower.
A few thousandths of an inch.

25. The worm gear is a combination of what?
Two surfaces move against one another.
Shafts lying at any given angle.
45
A screw and a spur gear.

26. The threads of a screw are cut so?
Same.
The force used to overcome friction is greater than the force used to do useful work.
Magnify or reduce the force which you apply.
45

27. How is distance measured in work?
fulcrum- weight- effort
Feet.
Foot- pounds
Count the number of parts of the rope going to and from the movable block.

28. Class two lever
To speed up the motion of resistence.
fulcrum- weight- effort
Simple machine
The rope that passes through your hands is greater than the distance that the load is raised.

29. What is another way to find the mechanical advantage of an inclined plane?
Length of ramp/length of height from floor to truck
32/8 = 4
1
Mechanical disadvantage. Use more force than the force of the load you lift.

30. The miter gear faces are beveled at what angle?
45
With oil - grease or soap.
The rope that passes through your hands is greater than the distance that the load is raised.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.

31. For Blocks and falls if you are getting a mechanical advantage what is the distance of your pull and the weights?
Less than 1.
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 rope that passes through your hands is greater than the distance that the load is raised.

32. What direction does the effort and resistance move in the second class levers?
Positive mechanical advantage.
Foot- pounds
Same.
Mechanical disadvantage. Use more force than the force of the load you lift.

33. How can you decrease friction on flat surfaces?
With oil - grease or soap.
2(pie)/pitch
Count the number of parts of the rope going to and from the movable block.
32/8 = 4

34. Gears can do a job for you by changing what three things?
The force used to overcome friction is greater than the force used to do useful work.
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.
Direction - speed or size of the force applied.

35. What type of lever provides a fractional mechanical advantage?
Gravity - Magnetism - Friction - Recoil
Third class lever.
Simple machine
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

36. What is the third thing a gear can do?
Mechanical disadvantage. Use more force than the force of the load you lift.
Magnify or reduce the force which you apply.
Opposite.
Increase or decrease the the speed of the applied motion.

37. What kind of machine is the inclined plane?
Gravity - Magnetism - Friction - Recoil
Two surfaces move against one another.
Simple machine
Direction - speed or size of the force applied.

38. An egg beater has a mechanical advantage of 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.
The change of the direction of the pull.
Less than 1.
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

39. What is the formula for the wheel and axle?
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
Increase or decrease the the speed of the applied motion.
In Horsepower.

40. What is the mechanical advantage of a single movable block?
Feet.
2. Each half of the rope carries an equal amount of weight.
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.

41. With a single fixed sheave what is the only mechanical advantage?
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 screw and a spur gear.
The change of the direction of the pull.
A modification of an inclined plane.

42. What is the first thing a gear can do?
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
2. Each half of the rope carries an equal amount of weight.
Can change the direction of motion.
Foot- pounds

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.
The rope that passes through your hands is greater than the distance that the load is raised.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Less than 1.

44. What is the second thing a gear can do?
Door knob.
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.

45. A miter gear connects what?
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Connects shafts having a 90 degree angle.
Power=Work/Time
2. Each half of the rope carries an equal amount of weight.

46. How is force measured in work?
Simple machine
In pounds.
Shafts lying at any given angle.
Count the number of parts of the rope going to and from the movable block.

47. What is the power formula?
Power=Work/Time
When a resistance is overcome by a force acting through a measurable distance.
Can change the direction of motion.
2. Each half of the rope carries an equal amount of weight.

48. What is the work formula?
Work=Force*Distance
Equals the weight of the object being hoisted.
Product of the number of teeth on the driven gears/ divided by the product of the number of teeth on the driver gears.
Same.

49. What is one type of second class lever?
Count the number of parts of the rope going to and from the movable block.
your arm.
Wheel and axle.
A screw and a spur gear.

50. hat is a screw?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
Less than 1.
A modification of an inclined plane.
Same.