| A | B |
|---|
| acceleration | the rate at which velocity changes over time |
| 9.8 m/s/s | rate at which all things on Earth fall |
| air resistance | the force which opposes motion through air |
| terminal velocity | constant velocity of a falling abject when air resistance is equal to the force of gravity |
| free fall | the motion of a body when only the force of gravity is acting on it |
| orbiting | when the two motions of moving forward and free fall are combined |
| centripetal force | the unbalanced force that causes objects to move in a circular motion |
| projectile motion | the curved path that an object follows when throw, launched, or projected near the surface of the Earth |
| inertia | the tendency of an object at rest to remain at rest; resistance to change |
| momentum | the product of the mass and velocity of an object |
| law of conservation of momentum | any time objects collide, the total amount of momentum remains the same |
