2 conditions for uniform motion: a) constant speed; b) constant direction (no turning).
If either of these conditions isn't there, then the motion is "non-uniform" or "accelerated".
Examples of uniform motion: a car in a drag race reaching and maintaining its maximum speed on a straight and flat race course; a space craft drifting between two galaxies; (very few real-life examples).
Examples of non-uniform motion: a racing horse; merry-go-around; swing; automotive braking; throwing a softball; etc.
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