Frame Of Reference
a system that uses coordinates to establish position
Relative Motion
the change in position of one object compared to the position of another
Distance
the property created by the space between two objects or points
Vector
a straight line segment whose length is magnitude and whose orientation in space is direction
Resultant Vector
The sum of two or more vectors
Speed
distance travelled per unit time
Average Speed
the total distance traveled divided by the time it takes to travel that distance
Instantaneous Speed
the rate at which an object is moving at a given moment in time
Velocity
the speed of an object in a particular direction
Acceleration
an increase in speed
Free Fall
the motion of a falling object when the only force acting on it is gravity
Constant Acceleration
velocity changing at a constant rate
Linear Graph
a line graph in which the data points yield a straight line
Nonlinear Graph
a graph in which the displayed data form a curved line