state any three laws of friction
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First law of friction: The amount of friction is proportional to the normal force exerted between the surfaces. Second law of friction: Friction does not depend on the area of contact between the object and the surface. Third law of friction: Friction force also depends on the nature of the surfaces in contact.
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These laws cover three different aspects of dry friction (Archard, 1957): Friction force is proportional to the normal load (first Amonton's law) Friction force is independent of the apparent contact area (second Amonton's law) Kinetic friction is independent of sliding speed (Coulomb's law)
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