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Asked by arup.isro 19th August 2018, 10:31 PM
Answered by Expert
Contact force exerted by one body on another is the resultant of Normal reaction force and frictional forces between the surfaces of body. 
If the contact force is equal to normal reaction force, then frictional force between the bodies is zero
Answered by Expert 20th August 2018, 1:00 PM
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