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Sunday, 10 November 2013

LAWS OF FRICTION



LAWS OF STATIC FRICTION (COLUMB’S LAW OF FRICTION)

        1.       The force of friction is always acting opposite to the direction of motion of the body.
        2.       The magnitude of the force of friction is exactly equal to the force which tends to move the body CP = F
        3.       The force of limiting friction bears a constant ratio with the normal reaction (R) between the contact surface i.e. F/R = constant = μ (co-efficient of froction)
        4.       The force of friction is independent of the area of the contact between the surface.
        5.       The frictional force depends upon the roughness of the surface in contact.
 

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