- 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 $y\text{-}$value when $x$= 0, or when the graph crosses the $y$-axis