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motion the state in which one objects distance from another is changing reference point a place or object used for comparasson to determine if something is in motion distance the length of a path between two points displacement is the length and direction that an object has moved from its starting point vector a quantity that consists of both a magnitude and a direction speed the distance the object travels per unit of time average speed divide total distance traveled by total time instantaneous speed the rate at which a object is moving at a given instant in time velosity is speed in a given direction slope steepness of a line on a graph acceleration the rate at which velocity changes with time