| inertia | the tendency of an object at rest to remain at rest or, if moving, to continue moving at a constant velocity |
| free fall | when gravity is the only force acting on an object |
| terminal velocity | the maximium velocity of an object |
| momentum | equal to the product of the mass and the velocity of an object |
| projectile motion | the curved path that an object follows when thrown, launched, or otherwise projected near the surface of Earth |