reference point - a place or object used for comparison to determine if an object is in motion, speed - the distance an object travels in one unit of time, velocity - speed in a given direction, slope - the steepness or slant of a line on a graph, plate - one of the major pieces that make up Earth's upper layer, acceleration - the rate at which velocity changes, linear - term used to describe a relationship between variables whose graph is a straight line,

physical science chapter 9

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