motion
if an object's position changes relative to another object
reference point
a place or object used for comparison to determine if something is in motion
International System of Units
units accepted as standard by the scientific community
distance
the length of the path between two points
speed
the distance the object moves per unit of time
average speed
dividing the total distance traveled by the total time
instantaneous speed
the speed at which an object is moving at a given instant in time
velocity
speed in a given direction
slope
the steepness of a line on a graph
acceleration
the rate at which velocity changes
