Which of the following statements accurately describes the sign of the work done on the box by the force of the push? 1- positiv

Question

Which of the following statements accurately describes the sign of the work done on the box by the force of the push?

1- positive

2- negative

3- zore

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Thu Cúc 5 years 2021-08-11T07:00:11+00:00 1 Answers 270 views 0

Answers ( )

  1. trucchi
    0
    2021-08-11T07:01:18+00:00
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    Answer: positive

    Explanation: according to newton’s second law of motion, the applied force (pull) will produce a motion for the box defined by the formulae

    f = ma, where m is the mass of the box and a is the acceleration.

    But due to friction, a force of the same magnitude but opposite in direction to the push is applied, hence we have that

    f – fr = ma

    Where fr is the frictional force.

    As we can see from the formulae, f (push) is responsible for a positive work while fr (friction) will bring about a negative work done.

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