Q. 21 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.
Step 1: Draw the graph
The approximate graph is shown in the diagram
Step 2: Explanation.
The frictional force f is shown on the vertical axis and the applied force F is shown on the horizontal axis. The portion OA of the graph represents static friction which is self-adjusting. In this portion, f = F.
Point B corresponds to the 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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