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A mass of 10 kg is at a point A on a table. It is moved to a point B. If the line joining A and B is horizontal

Monjur Alahi

A mass of 10 kg is at a point A on a table. It is moved to a point B. If the line joining A and B is horizontal, what is the work done on the object by the gravitational force? Explain your answer


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Salim Ahmed Kawsar

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The work down by the gravitational force acting on the body is zero because the direction of force is vertically downward and the displacement is horizontal i.e. force and displacement are perpendicular to each other.

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Salim Ahmed Kawsar

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Work done by gravity depends only on the vertical displacement of the body. It does not depend upon the path of the body. Therefore, work done by gravity is given by the expression,

W = mgh

where, Vertical displacement, h = 0

Therefore, W = mg × 0 = 0

Hence, the work done by gravity on the body is zero.

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