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Q.

Which of the following statements is not true

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a

The co-efficient of friction between two surfaces will increase if the surfaces are made rough

b

When a body slides on a surface the force of friction acts opposite to the direction of the applied  force

c

Rolling friction is more than sliding friction

d

The co-efficient of friction between wood and wood is less than 1 

answer is C.

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Detailed Solution

Sliding friction is greater than  μk>μr rolling friction 

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