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Chapter 9


motion the state in which one object's distance from another is changing
reference point A place or object used for comparison to discribe the position or motion of a person or object
distance the leght of a path between two points
displacement the lrngth and direction of a straight line between starting and ending points
vector a measurable quantity that consists of both a magnitude and a direction
speed the distance an object travels in certain period of time without regard to direction
average speed the overall rate of speed at which an object moves; calculated by dividing the total distance an object travels by the total time
instantaneous speed the speed of an object at any given instant
velocity speed in a given direction
slope the steepness of a line on a graph
acceleration the rate at which velocity with time
work aword that describes what is done an object when a force is exerted on an object that causes it to move
energy the ability to do work or cause change
kinetic enrgy energy that an object has due to its motion
potential energy stored energy that results from position or shap of an object
gravitational potential energy potential energy related to an object's height
elastic potenial energy the energy of stretched or compressed objects
mechanical energy an object's combined kinetic energy and potential energy
law of conseration of energy the rule that energy canont be created or destroyed