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h1. kinetic friction

{excerpt}Whenever sliding motion is occuring, friction will apply a force that is directly opposed to the sliding motion.  This force will have essentially constant size independent of the speed of the object for a given object sliding on a given surface.  The size of the friction force _will_ depend, however, on the contact force existing between the object and the surface and also on the material characteristics of the surface and the object.{excerpt}




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