Chapter - 4 Work and Energy

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Work and Energy


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.


Work done by the force of gravity on an object depends only on vertical displacement. Vertical displacement is given by the difference in the initial and final positions (height) of the object.

Work done by gravity is expressed as,

W = mgh


m is the mass of the object,

g is the acceleration due to gravity

h is the vertical displacement, which is zero.

Work done = mg(0) = 0 J

Thus, the work done by gravity on the given object is zero joules.

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