| A | B |
|---|
| acceleration | A change in velocity, including changes of direction and decreases as well as increases in speed. |
| force | A push or pull on an object. |
| gravity | The force responsible for the mutual attraction of separate masses. |
| kinetic energy | An object's energy of motion; for example, the force of a falling body. |
| mass | The quantity of matter in a body. |
| Newton | The unit used to measure force. |
| potential energy | The energy that exists in a body as a result of its position or condition rather than of its motion. |
| Newton's First Law | Every object will remain at rest or in uniform motion in a straight line unless an external force acts upon it and changes its direction. |
| Newton's Second Law | The velocity of an object changes when it is subjected to an external force. |
| Newton's Third Law | For every action there is an equal and opposite reaction. |
| velocity | The rate of speed. |
| inertia | The resistance of an object to change its state of motion. |
| weight | is a force of gravity on an object at the surface of a planet. |
| friction | the rubbing of two objects together. |
| unbalanced force | . When there is a net force that causes a change in an objects motion |
| balanced force | . Equal forces acting on an object in opposite direction |
| net force | the combination of all forces acting on an object at the same time. |
