Fast motion

Fast motion, also called accelerated motion, is an effect resulting from running film through a movie camera at slower-than-normal speed. When the film is projected at the standard rate of speed, action on the screen seems more rapid than it would in actual life. For example, a man riding a bicycle will display legs pumping furiously while he flashes through city streets at the speed of a racing car.
The opposite of fast motion is slow motion.

A VCR often has the option of fast motion playback, possibly at various speeds; this can be applied to any normally recorded scene. It is used for searching a scene, skipping advertising, etc.

See also Motion picture terminology