A box is pushed through $4.0 m$ across a floor offering $100 N$ resistance. How much work is done by the (i) applied force (ii) resistance force?

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Solution

Since box is just pushed to move it from one position to other applied force is equal to resistance force

$\Rightarrow$ Friction Force = Applied force = $100 N$
Ans(i)-
Work done by applied force $= F S = 100 \times 4 = 400 J$

Ans(ii)-
Work done by friction force $= F S = 100 \times 4 = 400 J$

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