Examples for work is said to be done and work is not said to be done
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Work done
Work done is positive only if the displacement is in the direction of force .
Examples :
Work done by a moving car .
Work done by a moving person .
Work done in moving a charge in conductor.
Work done in carrying a load for a distance.
Work done in moving an object.
Work done is said to be zero
Work done is said to be zero when the displacement is zero.
Examples
When a person pushes an object but fails to move it.
When a person is standing.
When we are sitting.
When no motion is caused in a body.
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