write two conditions under work is said to be done
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Two Conditions under which work is done :
work is done when the object moves through a certain distance in a particular direction after the force had been applied on it. For work to be done, the force must be applied and must not be zero.
work is done when the object moves through a certain distance in a particular direction after the force had been applied on it. For work to be done, the force must be applied and must not be zero.
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(i) Work done by a force - If the force and the displacement vectors are in the same direction, then ∅ = 0 and cos∅ = 1. In that case, W = Fs (F = force; s = displacement)
The force F is directly responsible for the displacement s.
(ii) Work done against a force - If the force and the displacement vectors are in opposite directions, then ∅ = 180° and cos∅ = -1. In that case, W = -Fs
The object is displaced in a direction opposite to the force acting on it.
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