Department of Pre-University Education, KarnatakaPUC Karnataka Science Class 11
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# 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 - Physics

Answer in Brief

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.
(a) The graph is a straight line of slope 45°.
(b) The graph is a straight line parallel to the F-axis.
(c) The graph is a straight line of slope 45° for small F and a straight line parallel to the F-axis for large F.
(d) There is a small kink on the graph.

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#### Solution

(c) The graph is a straight line of slope 45° for small F and a straight line parallel to the F-axis for large F.
(d) There is a small kink on the graph. When force F is applied on the block, the force of friction f comes into play. As we increase the  applied F,  the static friction force adjusts itself to become  (equal) to the applied force F  and goes upto  its maximum value equal to limiting friction force.After this ,it is treated as a constant force (i.e . now its value does not change until and unless the body starts moving). If the applied force F is greater than the limiting friction force, then the kinetic friction force comes into play at that time. The kinetic friction force is always less than the limiting friction force.

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#### APPEARS IN

HC Verma Class 11, 12 Concepts of Physics 1
Chapter 6 Friction
MCQ | Q 4 | Page 97
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