 | Term | Definition |
| |
motion |
the state in which one object's distance from another is changing |
| |
reference point |
a stationary place or object used for comparison to determine if an object is in motion |
| |
International System of Units |
A system of measurement based on multiples of ten and on established measures of mass, length, and time. |
| |
meter |
the basic SI unit of length |
| |
speed |
the distance an object travels per unit of time |
| |
average speed |
the overall rate of speed at which an object moves; calculated by dividing the total distance an objects travels by the total time |
| |
instantaneous speed |
the speed of an object at one instant of time |
| |
velocity |
speed in any given direction |
| |
slope |
the steepness of a line on a graph, equal to its vertical change divided by its horizontal change |
| |
plate |
one of the major pieces that makes up Earth's upper layer |
| |
theory of plate tectonics |
The theory that pieces of Earth's outer layer are in constant motion |
| |
acceleration |
The rate at which velocity changes |
