2 SPEED AND VELOCITY Tools A B Motion when an object changes its position relative to a reference point. Distance how far an object has moved Displacement distance and direction of an object's change of position from a starting point. Speed equation = distance an object travels per unit of time Constant speed speed that doesn't change over time. Average speed equation = total distance/total time Instantaneous speed speed at any given point in time. Graph-Position plot on vertical axis Graph-Time plot on horizontal axis Velocity speed AND direction of an objects motion. Acceleration equation = change in velocity/change in time Force is capable of changing an object's motion A change in direction results in an acceleration. When acceleration is 0 Speed is constant Mass The amount of matter in an object