To produce fast motion,the camera will actually record images at a speed slower than that at which the developed film will be projected.

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To produce the effect of fast motion in film, the camera records the scene at a slower frame rate than the standard projection frame rate (usually 24 frames per second). When played back at normal speed, the action appears faster because more time has passed in reality between each frame's capture than is perceived during playback.

To Produce Fast Motion,the Camera Will Actually Record Images at a Speed