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A Block is placed on rough floor and a horizontal force F is applied on it. The force of friction ‘f’ by floor on block is measured for different values of F and a graph is plotted between them.

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Graph is a straight line of slope $45^{0}$

There is a small kink on graph

Graph is straight line parallel to F-axis

the graph is straight line of slope $45^{0}$ for small F and straight line parallel to F-axis for large F

answer is C, D.

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Detailed Solution

For small value of F, friction f increases linearly upto limiting friction. When it crosses maximum point of static friction frictional force due to kinetic friction does not change.

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