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Question

A block is placed on a rough floor and a horizontal external 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. (taking f on Y and F on X axis)


  1. (a)The graph is a straight line of slope

  2. The graph is a straight line parallel to the F-axis

  3. The graph is a straight line of slope for small F and a straight line parallel to the F-axis for large F

  4. There is a small kink on the graph


Solution

The correct options are
C

The graph is a straight line of slope for small F and a straight line parallel to the F-axis for large F


D

There is a small kink on the graph


Limiting friction = μs mg

So till F fr

F = fr

So straight line at angle 45

After that even if Force F increases the value of friction will be fixed at μK  mg

So straight line also μK μs 

So there will be kink.

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