Hammer drives a nail into the wall only when lifted and then struck.

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Solution

Hammer drives a nail into the wood only when it is lifted up and then struck.
As the hammer is lifted up and strikes the nail it gains kinetic energy, which in turn is used to move the nail down into the block.
Thus the kinetic energy of the moving hammer does work on the nail.

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Similar questions

Give reasons for the following :

(a) No work is done if a man is pushing against a wall.

(b) The hammer drives a nail into the wood only when it is lifted up and then struck.

(d) A teacher moving around in the class is doing work but a child standing and reading a book is not doing any work?

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An axe cuts only when it is lifted and then struck.

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