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motion The state in which an object's distance from another is changing reference point a place or an object used for camparison to detirmine if in object is in motion International system of units (SI) A system of measurment based on multiples of ten and oin established measures of mass, length, and time meter The basic SI unit of length speed The distance an object travels per unit of time average speed The overal rate of speed at which an object moves; cauculated by dividing the total distance an object travels by the total time velocity Speed in a given direction slope The steepness on a line on a graph, equal to its vertical change divided by its horizonal change