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A system of objects that are not moving with respect to one another.
Frame of reference

Movement in relation to a frame of reference.
Relative motion

The lenght of a path between two points.
Distance

A quantity that has magnitude and direction.
Vector

The vector sum of two or more vectors.
Resultant vectors

The ratio of the distance an object moves to the amount of time the object moves.
speed

The total distance traveled by the time it takes to travel that distance.
Average speed

The rate at which an object is moving at a given moment in time.
Instantaneous speed

The speed and direction in which and object is moving.
Velocity

The rate at whichvelocity changes.
Acceleration

The movement of an object towards Earth solely because of gravity.
Free fall

A steady change in velocity.
Constant acceleration

A graph in which the displayed data forms a linear line.
Linear graph

A grapgh in which the displayed data forms a curved line.
Nonlinear graph.

