What is kinetic friction? What is rolling friction?

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(N/A) Kinetic friction is the resistive force that opposes the relative motion between two surfaces in contact when one surface is sliding over the other. It acts in the direction opposite to the direction of motion.
Rolling friction is the resistive force that opposes the motion of a body (like a wheel or sphere) when it rolls over a surface. It is generally much smaller than kinetic (sliding) friction because the area of contact is significantly reduced.

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