| A | B |
|---|
| motion | the state in which one objects distance from another is changing |
| force | a push or pull exerted on an object |
| inertia | the tendency of an object to resist any change in motion |
| friction | the force that one surface exerts on another when the two surfaces rub against each other. |
| gravity | the force of attraction that pulls objects toward each other |
| acceleration | the rate at which velocity changes |
| velocity | the speed of an object in a given direction |
| centripetal force | a force that causes an object to move in a circle |
| unbalanced force | a force that changes an object's motion |
| momentum | the product of an object's mass and velocity |
| speed | the rate of motion; the distance an object travels per unit of time |
| mass | the amount of matter in an object |
