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Assertion :- In case of rolling without sliding, friction force can act in forward and backward direction both.
Reason :- The angular momentum of a system will be conserved only about that point about which external angular impulse is zero.

Asked by minipkda 23rd May 2018, 10:00 PM
Answered by Expert
In case of rolling without sliding, frictional force acts in both forward and backward direction. - is true statement.
The angular momentum is conserved only about that point where the external angular impulse is zero-  is true statement. 
But second statement is not the reason for the first statement.
Answered by Expert 24th May 2018, 2:43 PM
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