The following statement is one of the laws of Dynamic friction

Question

Options:

A . The force of friction always acts in a direction opposite to that in which a body is moving

B . The magnitude of the kinetic friction bears a constant ratio to the normal reaction between two surfaces. The ratio being slightly less than that in the case of limiting friction

C . For moderate speeds the force of friction remains constant but decreases slightly with the increase of speed

D . All the above

Answer: Option D

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