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7 February, 16:06

Which of the following is the reason a lever is used in a shovel?

A. a lever is used to decrease effort force

B. a lever is used to decrease resistance force

C. a lever is used to increase resistance force

D. a lever is used to increase the effort force

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Answers (2)
  1. 7 February, 16:18
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    Which of the following is the reason a lever is used in a shovel?

    D. a lever is used to increase the effort force
  2. 7 February, 16:32
    0
    The figure shown below illustrates a lever being used to lift a weight W.

    The applied force is F.

    In order to lift the weight, the minimum applied force is

    F*b = W*a

    F = (a/b) W

    When the ratio a/b < 1, then the applied force is less than the weight.

    The principle behind the use of a lever is to keep the ratio a/b small in order to decrease the effort force.

    Answer: A

    A lever is used to decrease effort force.
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