A block is placed on a rough floor and a horizontal force F is applied on it. The force of friction f by the floor on the block is measured for different values of F and a graph is plotted between them-
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Until the applied horizontal force 
is increased to a Limiting force the block does not move because this horizontal force is balanced by force of friction f. Up to this point the graph is a straight line of slope 
. Beyond this point the block moves with a uniform velocity for even less than the Limiting force, at this point the graph has a small kink. Now even if the F is increased f remains constant, so now the graph gets parallel to F-axis.
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