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Question

A body of mass m lies at rest on a rough horizontal surface. The frictional force acting on he body is


A
mg
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B
2 mg
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C
mg2
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D
Zero
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Solution

The correct option is D Zero
We know that when an object is at rest, static friction comes into existence when a force is applied to it and it varies gradually. So when the object is lying on a rough surface and no force is applied to it then there is nothing to resist hence friction is also zero.


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