Question

define motion and things necessary to describe motion​

Answer 1

In physics, motion is the change in position of an object with respect to its surroundings in a given interval of time. As there is no absolute frame of reference, absolute motion cannot be determined. Thus, everything in the universe can be considered to be moving.

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Answer 2

Motion is the change in position of an object with respect to its surroundings in a given interval of time.

We can describe the motion of an object by its position, speed, direction, and acceleration. An object is moving if its position relative to a fixed point is changing. Even things that appear to be at rest move.