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Question

When static, sliding and rolling frictional forces are to be arranged in an increasing order, which one of the following options would be correct?


A

Rolling friction < Sliding friction < Static friction

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B

Static friction < Sliding friction < Rolling friction

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C

Sliding friction < Static friction < Rolling friction

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D

Rolling friction < Static friction < Sliding friction

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Solution

The correct option is A

Rolling friction < Sliding friction < Static friction


When the box starts sliding, the contact points on its surface do not get enough time to lock into the contact points on the floor. So the sliding friction is smaller than the static friction. If a wheel rolls without slipping, we need not apply any force against the locking between the surfaces and thus less force is required as compared to sliding friction. So rolling friction is less than the sliding friction. So, Rolling friction < Sliding friction < Static friction.


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