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A block placed on a rough horizontal sur...

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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The graph of F versus f is as shown in The portion `OA` of graph represents static friction which is self adjusting. In this portion ` f = F` The point `B` corresponds to force of limitting friction `(=OB)` , which is the maximum value of static friction `CD` `OX` 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
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