| Term | Definition |
| motion diagram | a series of images showing the positions of a moving object at equal time intervals |
| particle model | a simplified version of a motion diagram in which the object in motion is replaced by a series of single points |
| coordination system | tells you the location of the zero point of the variable you are studying and the direction in which the values of the variable increase |
| origin | the point at which variables have the value zero |
| position | the separation between an object and an origin |
| distance | how far the object is from the origin |
| magnitude | size |
| vectors | quantities that have both size and direction |
| scalars | quantities that are just numbers without direction, such as distance, time, or temperature |
| resultant | the vector that repersents the sum of the other two vectors |
| time interval | the difference between two times ∧t=tf-ti |
| displacement | the vector quantity that defines the distance and direction between two positions ∧d=df-di |
| instantaneous velocity | the speed and direction of an object at a particular instant |
| average velocity | ratio of the change in position to the time interval during which the change occured |
| position-time graph | a graph with time data on the horizontal axis and position data on the vertical axis |
| instantaneous position | to location of an object at a particular instant |
| average speed | the absolute value of the slope on a position-time graph |