Question: A friction force is (a) A contact force that acts parallel to the contact surfaces. (b) A contact force that acts perpendicular to the contact

A friction force is
(a) A contact force that acts parallel to the contact surfaces.
(b) A contact force that acts perpendicular to the contact surfaces.
(c) A scalar quantity since it can act in any direction along a surface.
(d) Always proportional to the weight of an object.
(e) Always equal to the normal force between the objects.

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