**acceleration**the rate of change in velocity; the change in velocity over time

**acceleration due to gravity**acceleration of an object as a result of gravity

**average acceleration**the change in velocity divided by the time over which it changes

**average speed**distance traveled divided by time during which motion occurs

**average velocity**displacement divided by time over which displacement occurs

**deceleration**acceleration in the direction opposite to velocity; acceleration that results in a decrease in velocity

**dependent variable**the variable that is being measured; usually plotted along the y-axis

**displacement**the change in position of an object

**distance**the magnitude of displacement between two positions

**distance traveled**the total length of the path traveled between two positions

**elapsed time**the difference between the ending time and beginning time

**free-fall**the state of movement that results from gravitational force only

**independent variable**the variable that the dependent variable is measured with respect to; usually plotted along the x-axis

**instantaneous acceleration**acceleration at a specific point in time

**instantaneous speed**magnitude of the instantaneous velocity

**instantaneous velocity**velocity at a specific instant, or the average velocity over an infinitesimal time interval

**kinematics**

the study of motion without considering its causes

**model**simplified description that contains only those elements necessary to describe the physics of a physical situation

**position**the location of an object at a particular time

**scalar**

a quantity that is described by magnitude, but not direction

**slope**the difference in y-value (the rise) divided by the difference in x-value (the run) of two points on a straight line

**time**change, or the interval over which change occurs

**vector**

a quantity that is described by both magnitude and direction

**y-intercept**the y-value when x= 0, or when the graph crosses the y-axis

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