Multiple Choice
Identify the
letter of the choice that best completes the statement or answers the question.
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| 1. | The
fixed point that a lever pivots on is called the ... a. | axle. | b. | pulley. | c. | gear. | d. | fulcrum. | | | | | | | | |
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| 2. | Most
of the “machines” in your body consist of bones and muscles and are called
... a. | wedges. | b. | levers. | c. | pulleys. | d. | compound
machines. | | | | | | | | |
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| 3. | Which
body parts act as the fulcrums of levers? a. | muscles | b. | bones | c. | joints | d. | tendons | | | | | | | | |
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| 4. | Archimedes, a famous Greek engineer and mathematician, once said, “Give me a
lever long enough, and a place to stand and I will move the earth.” a. | He was
definitely wrong | c. | He left out
getting the fulcrum close to the load. | b. | He was exactly right. | d. | This makes no sense. | | | | |
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| 5. | You
could lift a car with your little finger by .... a. | having a very long lever. | c. | standing on a ladder to reach your
lever. | b. | putting the fulcrum right next to the
car. | d. | all of the
above. | | | | |
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| 6. | On a seesaw a 2
kg weight is placed at -3 feet away from a fulcrum. A 1 kg weight is placed on the opposite side of
the seesaw at +6 feet away from the fulcrum. This lever is balanced. Without changing the amount of
force on either side, which combination below will also work? a. | -2 &
+3 | d. | -4 &
+7 | b. | -2 &
+4 | e. | none of the
above | c. | -1 & +1 | | | | |
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| 7. | In
order to get a great mechanical advantage, you must meet two conditions: a. | short lever
& fulcrum close to the object | c. | Long lever and long RD | b. | fulcrum at the
lever midpoint & a long lever | d. | Long ED and very short RD | | | | |
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| 8. | The
disadvantage to a lever is.... a. | it takes extra time, rather than just lifting the
object | d. | if you
can’t get the fulcrum REALLY close, you loose mechanical advantage | b. | you must move
the effort end of a lever a long way to get not much lift. | e. | all of the above | c. | it’s hard
to get a lever long enough | | | | |
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| 9. | The
formula for determing Mechanical Advantage (MA) is.... a. | FP /
FA | b. | ED /
RD | c. | neither a or
b | d. | both a and
b | | | | | | | | |
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True/False
Indicate whether the sentence or statement is true
or false.
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| 10. | When
the fulcrum is in the middle of the lever, the amount of effort needed to lift the load is 1/2 the
weight of the load to be lifted.
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| 11. | When
the fulcrum is between the midpoint of the lever and the load, the amount of effort needed to lift
the load is less than the weight of the object to be lifted.
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| 12. | When
the fulcrum is between the midpint of the lever and the force applied, a mechanical advantage of less
than 1 will result.
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| 13. | Lifting an object straight UP would yield a mechanical advange of 2.
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| 14. | When
the fulcrum is very close to the load, the mechanical advantage increases dramatically.
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| 15. | If
you can’t manage to get your fulcrum close enough to the load to get a mechanical advantage of
greater than one, you are wasting your time.
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| 16. | Mechanical advantage means you are multiplying your effort.
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| 17. | The
reading on the spring scale is referred to as the Force Produced (FP).
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| 18. | The
spring scale never needs to be adjusted. It’s readings are always accurate.
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| 19. | If
you understand how levers work, you could lift a heavy car with your little finger.
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Matching
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| 20. | Spring Scale
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| 21. | Fulcrum
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| 22. | Resistance Distance
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| 23. | Force
Produced
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| 24. | Effort Distance
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| 25. | Force
Applied
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| 26. | Point
on the graph where FA = FP
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| 27. | If
your mechanical advantage falls here, you are wasting your time.
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| 28. | If
your mechanical advantage falls here you can lift a heavy object easily!
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