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Net Contact Force

A body of 10 ...

Question

A body of 10 N weight is resting on a plane surface. If external force of 5 N is exerted on the body as shown in the figure, then friction force acting on the body by surface is:

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5 N

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10 N

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15 N

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Solution

The correct option is B 5 N
Since the body is rest on the plane surface so the minimum required friction force will be the applied force, F.
Thus, the friction force , $f = F = 5 N$

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