Frictional force
Friction is define as the opposing force that try to resist the speed of the body.It is produced due to contact of two body or more with each other. Friction : When we try to slide a body on a surface, the motion of the body is opposed by a force called the force of friction. The frictional force arises due to intermolecular interaction. When a body is at rest on a surface and no external force is applied, no friction exists. In this case the normal reaction R balances the weight Mg i.e. for vertical equilibrium R = Mg and frictional force...
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