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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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Let us consider the drawn diagram
The frictional force $f$ acts on vertical axis and the applied force $F$ acts on the horizontal axis. The portion $O A$ of graph represents static friction $\left(f_s\right)$ which is self adjusting. In this portion, $f_s=F$.
The point $B$ corresponds to force of limiting friction which is the maximum value of static friction. $C D \| O X$ represents kinetic friction when the body actually starts moving. The force of kinetic friction does not increase with applied force and is slightly less than limiting friction and it start to move with less friction $\left(f_k < f_s\right)$
The frictional force $f$ acts on vertical axis and the applied force $F$ acts on the horizontal axis. The portion $O A$ of graph represents static friction $\left(f_s\right)$ which is self adjusting. In this portion, $f_s=F$.
The point $B$ corresponds to force of limiting friction which is the maximum value of static friction. $C D \| O X$ represents kinetic friction when the body actually starts moving. The force of kinetic friction does not increase with applied force and is slightly less than limiting friction and it start to move with less friction $\left(f_k < f_s\right)$
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