Chapter - 4 Work and Energy

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Q
Work and Energy

Question:

An object thrown at a certain angle to the ground moves in a curved path and falls back to the ground. The initial and the final points of the path of the object lie on the same horizontal line. What is the work done by the force of gravity on the object?

Answer:

In the above question, the object is thrown at a certain angle to the ground moves in a curved path and falls back to the ground. The initial and the final points of the path of the object lie on the same horizontal line.

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, which is zero in this case.

Work done by gravity is expressed as,

W = mgh

Where,

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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