| A | B |
|---|
| force | A push or a pull that acts on an object. |
| newton | Unit for force that is equal to that causes a 1 kg mass to accelerate 1 meter per second per second. |
| net force | The overall force acting on an object. |
| friction | The force that opposes (goes against) motion. |
| air resistance | Fluid friction acting on an object moving through the air. |
| gravity | Attraction between two objects because of their masses. |
| terminal velocity | Occurs when the force of air resistance equals the force of gravity. |
| projectile motion | The curved path of an object in free fall after it has been given an initial forward velocity. |
| inertia | An object's resistance to change in its motion. |
| mass | The amount of matter an object contains. |
| weight | The force of gravity acting on an object. |
