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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. The bevel gear is used to connect what?
Shafts lying at any given angle.
2(pie)/pitch
32/8 = 4
A few thousandths of an inch.

2. What direction does the effort and resistance move in the second class levers?
To magnify the applied force.
Same.
Third class lever.
The force used to overcome friction is greater than the force used to do useful work.

3. 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
Third class lever.
Increase or decrease the the speed of the applied motion.

4. How is force measured in work?
In pounds.
Increase or decrease the the speed of the applied motion.
your arm.
Mechanical disadvantage. Use more force than the force of the load you lift.

5. How is distance measured in work?
Feet.
Increase or decrease the the speed of the applied motion.
Power=Work/Time
A screw and a spur gear.

6. 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.
Magnify or reduce the force which you apply.
The force used to overcome friction is greater than the force used to do useful work.
Same.

7. What direction does the effort and resistance move in third class levers.
1
Door knob.
Shafts lying at any given angle.
Same.

8. 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.
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
With oil - grease or soap.
Third class lever.

9. What is the jack screw used for?
Connects shafts having a 90 degree angle.
To raise a house or other heavy machinery.
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

10. Work is measured in units also known as?
Same.
A screw and a spur gear.
Gravity - Magnetism - Friction - Recoil
Foot- pounds

11. What kind of machine is the inclined plane?
Simple machine
Work=Force*Distance
A few thousandths of an inch.
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

12. Class two lever
fulcrum- weight- effort
Equals the weight of the object being hoisted.
In pounds.
your arm.

13. How do you find the mechanical advantage?
2. Each half of the rope carries an equal amount of weight.
To raise a house or other heavy machinery.
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.
When a resistance is overcome by a force acting through a measurable distance.

14. What is the third thing a gear can do?
A few thousandths of an inch.
Magnify or reduce the force which you apply.
Wheel and axle.
Third class lever.

15. What type of lever provides a fractional mechanical advantage?
Third class lever.
A screw and a spur gear.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Length of ramp/length of height from floor to truck

16. The miter gear faces are beveled at what angle?
A modification of an inclined plane.
A screw and a spur gear.
45
A few thousandths of an inch.

17. What is another example of a wheel and axle?
Power=Work/Time
Door knob.
Count the number of parts of the rope going to and from the movable block.
A few thousandths of an inch.

18. A miter gear connects what?
A screw and a spur gear.
Power=Work/Time
Door knob.
Connects shafts having a 90 degree angle.

19. Friction is involved when?
Two surfaces move against one another.
Foot- pounds
A screw and a spur gear.
Shafts lying at any given angle.

20. An egg beater has a mechanical advantage of what?
fulcrum- weight- effort
To magnify the applied force.
Less than 1.
2. Each half of the rope carries an equal amount of weight.

21. With a single fixed sheave what is the only mechanical advantage?
A screw and a spur gear.
Third class lever.
The change of the direction of the pull.
Connects shafts having a 90 degree angle.

22. 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.
45
When a resistance is overcome by a force acting through a measurable 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.

23. Fractional mechanical advantage
Same.
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.
The force used to overcome friction is greater than the force used to do useful work.
Mechanical disadvantage. Use more force than the force of the load you lift.

24. What is the purpose of a third class lever?
Work=Force*Distance
In pounds.
To speed up the motion of resistence.
Same.

25. What is the first thing a gear can do?
Door knob.
Connects shafts having a 90 degree angle.
Can change the direction of motion.
A modification of an inclined plane.

26. What are first and third class levers used for?
To magnify the applied force.
Feet.
2(pie)/pitch
Foot- pounds

27. What are the 4 forces?
Gravity - Magnetism - Friction - Recoil
Foot- pounds
2(pie)/pitch
Door knob.

28. How is work done?
When a resistance is overcome by a force acting through a measurable distance.
Work=Force*Distance
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.

29. What is the mechanical advantage of a single movable block?
2. Each half of the rope carries an equal amount of weight.
The change of the direction of the pull.
Third class lever.
A few thousandths of an inch.

30. Formula for fractional mechanical disadvantage.
Mechanical disadvantage. Use more force than the force of the load you lift.
Effort arm/Resistance arm - A/a - An expression of the ratio of the applied force and the resistance.
Simple machine
Increase or decrease the the speed of the applied motion.

31. What is the work formula?
Work=Force*Distance
fulcrum- weight- effort
A modification of an inclined plane.
2(pie)/pitch

32. What is another way to find the mechanical advantage of an inclined plane?
A few thousandths of an inch.
Length of ramp/length of height from floor to truck
2(pie)/pitch
Gravity - Magnetism - Friction - Recoil

33. What is the second thing a gear can do?
Can change the direction of motion.
Product of the number of teeth on each of the driver gears/ divided by the product of number of teeth of the driven gear.
Increase or decrease the the speed of the applied motion.
fulcrum- weight- effort

34. The worm gear is a combination of what?
Same.
Mechanical disadvantage. Use more force than the force of the load you lift.
A screw and a spur gear.
Gravity - Magnetism - Friction - Recoil

35. What kind of mechanical advantage does the first and second class lever provide?
Positive mechanical advantage.
Magnify or reduce the force which you apply.
Equals the weight of the object being hoisted.
The rope that passes through your hands is greater than the distance that the load is raised.

36. hat is a screw?
Magnify or reduce the force which you apply.
Opposite.
Feet.
A modification of an inclined plane.

37. What does a micrometer measure?
32/8 = 4
Same.
A few thousandths of an inch.
A screw and a spur gear.

38. What is the power formula?
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.
Work=Force*Distance
Power=Work/Time

39. What is an example of a third class lever?
The rope that passes through your hands is greater than the distance that the load is raised.
your arm.
2. Each half of the rope carries an equal amount of weight.
Less than 1.

40. 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.
The change of the direction of the pull.
The rope that passes through your hands is greater than the distance that the load is raised.
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.

41. What is the mechanical advantage for a single fixed block?
L/l=R/E Length of effort arm divided by length of resistance arm divided by weight of resistance divided by Effort.
To speed up the motion of resistence.
1
In pounds.

42. 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.
Same.
Opposite.
The force used to overcome friction is greater than the force used to do useful work.

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

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

45. What is one type of second class lever?
Feet.
To magnify the applied force.
Wheel and axle.
With oil - grease or soap.

46. With a single fixed sheave on a block and tackle what must the force of your down pull equal?
Equals the weight of the object being hoisted.
2. Each half of the rope carries an equal amount of weight.
Foot- pounds
Mechanical disadvantage. Use more force than the force of the load you lift.

47. What is the formula for the mechanical advantage of a screw?
A modification of an inclined plane.
2(pie)/pitch
The rope that passes through your hands is greater than the distance that the load is raised.
your arm.

48. 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.
Increase or decrease the the speed of the applied motion.
32/8 = 4
fulcrum- weight- effort

49. 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.
To magnify the applied force.
45

50. The threads of a screw are cut so?
Work=Force*Distance
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.
2(pie)/pitch