1.
average speed: how fast an object is moving, the absolute value of the slope of an object's position-time graph
2.
average velocity: the change in position, divided by the time during which the change occurred; is the slope of an object's position-time graph
3.
coordinate system: a system used to describe motion that gives the zero point location of the variable being studies and the direction in which the values of the variable increase
4.
displacement: a change in position having both magnitude and direction; is equal to the final position minus the initial position
5.
distance: a scalar quantity that describes how far an object is from the origin
6.
instantaneous position: the position of an object at any particular instant in time
7.
instantaneous velocity: a measure of motion that tells the speed and direction of an object at a specific instant in time
8.
magnitude: a measure of size
9.
motion diagram: a series of images showing the positions of a moving object taken at regular (equal) time intervals
10.
origin: a point at which both variables in a coordinate system have the value zero
11.
particle model: a simplified version of a motion diagram in which the moving object is replaced by a series of single points
12.
position: the separation between an object and the origin; it can be either positive or negative
13.
position-time graph: a graph that can be used to determine an object's velocity
14.
resultant: a vector that results from the sum of two other vectors; it always points from the first vector's tail to the last vector's tip
15.
scalar: quantities, such as temperature or distance, that are just numbers without any direction
16.
time interval: the difference between two times
17.
vector: quantities, such as position, that have both magnitude and direction
