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

1. A boy with his heavy bag waiting at bus stop does no work because no displacement takes place and work depends upon displacement.Here, displacement is zero,therefore no work done.

2. Because it's mechanical advantage is greater than 1,hence it acts as a force multiplier.

Answer 2

Answer:

1. A boy with a heavy bag waiting at a bus stop does no work . work done = force * displacement . the boy has no displacement i.e. s = 0 . hence work done  as a whole will be zero
2. An inclined plane acts as a force multiplier because sliding friction is less than ground friction and hence less force is required to move an object through  inclined plane . since less force is required it is considered as  a force multiplier