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WHAT IS UNIFIRM MOTION
Did you meant uniform motion?

then answer is as follows
As shown by Einstein's Principle of Relativity, motion is a necessarily relative concept: what appears to be moving from one frame of reference may not appear to be moving, or moving in the same way, from another frame of reference. From a physical point of view, all frames of reference are given equal validation. So uniform motion itself will also be a relative concept. If an object A is in uniform motion relative to another object B, then from B's view there appear to be no force applied to A; i.e. it appears to be neither accelerating nor decelerating, nor changing directions or moving in a curve. The same should apply vice versa.
translation: uniform motion is something moving in a straight line at a consistent speed


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