state the law of kinetic friction
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When an object is moving, the friction is proportional and perpendicular to the normal force (N) Friction is independent of the area of contact so long as there is an area of contact. The coefficient of static friction is slightly greater than the coefficient of kinetic friction.
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amontons 'first law:the force of friction is directly proportional to the applied load.
second law: kinetic friction is independent of the sliding velocity.
second law: kinetic friction is independent of the sliding velocity.
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