Motion

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Frame of reference

is a system of objects that are not moving with respect to one another

Relative motion

is the movement in relation to a frame of reference

Distance

is the length of a path between two points

Vector

a quantity that has magnitude and direction

Resultant Vector

sum of two or more vectors

Speed

is the ratio of the distance an object moves to the amount of time the object moves

Average speed

is the total distance traveled divided by the time it takes to travel that distance

Instantaneous Speed

is the rate at which an object is moving at a given moment in time

Velocity

the speed and the direction in which an object is moving

Acceleration

the rate at which velocity changes

Free Fall

the movement of an object toward Earth solely because gravity

Constant Acceleration

A steady change in velocity

Linear graph

displayed data forms straight-line parts

Nonlinear graph

a curve that connects data points that are plotted