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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 .

Text Solution

Verified by Experts

The approximate graph is shown in the diagram

The frictional force f is shown on vertical axis and the applied force F is shown on the horizontal axis. The portion OA of graph represents static friction which is self adjusting .In this portion , f = F .
This point B corresponds to force of limiting friction 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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