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Work

Cases where work is not     done

Units of work

Positive and Negative Work

Examples on Work Done

Variable Force

Example on Variable Force

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Work

 Consider the simplest possible case of work done. A force ‘F’ is acting on an object. The object has a displacement ‘S’ in the direction of the force. Then the work done is the product of force and displacement.

What will happen in the case when the applied force is not in the direction of displacement but rather at an angle to it. In such a case we will consider the component of force in the direction of displacement. This component will be effective in doing work as shown.

Component of force in the direction of displacement is F Cos θ.

W = (F Cos θ) S = F. S

Work done is a scalar quantity.