Kinetic friction opposes the motion of two systems in contact and moving relative to each other by converting kinetic energy into heat.
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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