| A | B |
|---|
| force | a push or a pull |
| motion | how an object's position changes over time |
| speed | a measurement of distance over time |
| acceleration | a change in motion caused by a change in speed |
| velocity | an object's speed in a specific direction |
| inertia | objects remain at rest or in motion unless acted on by a force |
| gravity | the force that pulls objects toward the center the Earth |
| friction | forces that slow down or stop movement |
| balanced force | a net force that is zero |
| unbalanced force | a net force that is not zero |
