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Question

In a laboratory experiment on friction, a block of weight 135 N lying on a rough horizontal table is pulled by a horizontal wire. The pull (P) gradually increases until the block begins to move and continues to increase thereafter. Given figure shows a graph of the friction force (f) on this block as a function of the pull (P)


The region of the graph where kinetic friction occur is

A
P<50 N
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B
P>75 N
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C
P=0 N
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D
P<75 N
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Solution

The correct option is B P>75 N
If applied force keeps on increasing suddenly the object starts moving and the value of resisting friction force decreases and continues with a constant value of friction, at this stage it is known as Kinetic friction. Kinetic friction has a constant value but little less than Limiting friction. Kinetic friction occurs when an object is in motion and it has a constant value as shown in the given graph. Kinetic friction starts acting from P<75 N i.e. option (2)

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