Final answer:
Kinetic friction opposes the motion of two systems in contact and moving relative to each other by converting kinetic energy into heat.
Explanation:
Kinetic friction occurs between two surfaces that are in contact and moving relative to each other. It is a force that opposes the motion of these systems by converting kinetic energy into heat.
For example, when a sled slides on the ground, the friction between the sled and the ground is an instance of kinetic friction.
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