The force of friction between two bodies in contact
(a) Depends upon the area of their contact
(b) Depends upon the relative velocity between them
(c) Is always normal to the surface of their contact
(d) All of the above
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Explanation:
Friction is determined by the two surfaces in contact, and how tightly the two surfaces are pushed together (normal force F N F_N FNF, start subscript, N, end subscript). Coefficient of friction ( μ): this describes the roughness between two surfaces. A high coefficient of friction produces more friction.
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