Question

Give reasons for the following statements. 1.A boy with his heavy bag waiting at the bus stop does no work. 2.An inclined plane acts as a force multiplier.
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Answer 1

Answer:

1.because he is in rest.

2. it makes movement easy

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Answer 2

Answer:

Here man does not have any displacement because he is just waiting.We know that

W=F×s×cosθ ; as s=0 which implies W=0.

Hence, no work is done by the man in carrying the box.

An inclined plane is a force multiplier because it always have M.A greater than 1. Its ma is always greater than 1 because we know that M.A. of an inclined plane is 1/sin (of the angle at which it is inclineded) and sin is always less or equal to 1