| A | B |
|---|
| motion | when an object changes position over time when compared with a reference point |
| Inertia | the tendency of all objects to resist any change in motion |
| velocity | the speed of an object in a particular direction |
| acceleration | the rate at which velocity changes |
| force | a push or pull (has both size and direction) |
| newton | unit to express force |
| momentum | a property of a moving object that depends on the object's mass and velocity. |
| friction | a force that opposes motion between two surfaces that are touching |
| gravity | a force of attraction between objects that is due to their masses |
| projectile motion | the curved path an object follows when thrown or propelled near the surface of the Earth |
| Newton's first law | an object at rest remains at rest and an object in motion remains in motion unless acted on by an unblanced force |
| newton's second law | the acceleration of an object depends on the mass of the object and the amount of force applied |
| newton's third law | whenever one object exerts a force on a second object, the second object exerts an equal and opposite force on the first. |
| net force | the force that results from combining all the forces exerted on an object |
| speed | the rate at which an object moves |
