a coolie is moving on a road with a luggage on his head does he perform any work against the gravity ? give reasons
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no ....no work is done....
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 = F x s x 0 = 0
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 = F x s x 0 = 0
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