Another term for slow motion, where time appears to be moving slowly in a video is

Slow motion (commonly abbreviated as slo-mo or slow-mo) is an effect in film-making whereby time appears to be slowed down. It was invented by the Austrian priest August Musger in the early 20th century.

Explanation:

The slow motion means the movement of object /body with respective to its surrounding but with a relative slower speed. The fast motion means the movement of object /body with respective to its surroundings but with relative greater speed.

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