what is the relationship amoung (a) magnitude of friction and the weight of the object, (b) friction and nature of surfaces in contact with each other, (c) friction and area of the surfaces in contact with each other?
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N is directly proportional to weight of the body and it also depend on the inclination of the plane with horizontal.so friction force is also directly proportional to weight of the body. if the surfaces in contact are smooth then friction is less and if the surface are rough then the friction force is more
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