Friction is independent of
(1) smoothness
(2) Area of contact
(3) normal force
(4) none
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Friction is independent of
Area of contact
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Friction is independent of the area of contact(Option 2)so long as there is an area of contact. The coefficient of static friction is slightly greater than the coefficient of kinetic friction. Within rather large limits, kinetic friction is independent of velocity. Friction depends upon the nature of the surfaces in contact.
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