Question

what is thework done by a coolie walking on a horizontal platform with a load on his head

Answer 1

1. Work done by a coolie, walking on level road with load on his head, on the load is zero. 2. Work done = Force x displacement W = F.s = Fs cos θ where θ is the angle between the direction of force and the direction of displacement of the object. If they are perpendicular to each other θ = 90°. We have cos 90° = 0. Therefore W = Fxsx0 = 0

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Answer 2

Answer: 0 work is done

Explanation:

When a coolie walks on a horizontal platform with a load on his head, no work is done against the force of gravity becoz the displacement of load is normal to the direction of force of gravity which is vertically downwards.

Note: The coolie does work against the force of friction when he moves with the load

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