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Mechanical Advantage in Lever

A block place...

Question

A block placed on a rough horizontal surface is pulled by a horizontal force 𝐹. Let $f$ be the force applied by the rough surface on the block. Plot a graph of $f$ versus $F$ .

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Solution

As friction force is a self-adjusting force it increases linearly with applied force $(F)$ but after gaining its maximum value $(μ N)$ it remains constant.

Final Answer. $f = F$ until the block is stationary. $f$ remains constant if $F$ increases beyond this point and the block starts moving.

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