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 $F$.
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 $F$.
$OA$ part of graph shows static friction which is self adjusting force. In this region frictional force = external force $(F)$.
Point $B$ shows limiting friction which represent maximum static friction.
Once block comes into motion there is kinetic friction. Kinetic friction is less than static friction.
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The limiting friction is
The limiting friction is