Fast motion
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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 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. Cinematographers refer to fast motion as undercranking since it was originally achieved by cranking a handcranked camera slower than normal.
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