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 Acceleration due to Gravity | The change in velocity of a falling object divided by the time the change occurs; All objects falling towards Earth accelerate at a rate of 9.8 m/s² |
| Terminal Velocity | The constant velocity of a falling object when the force of air resistance is equal to the force of gravity |
| Free Fall | The motion of a body when only the force of gravity, and not air resistance, is acting on the object. |
| Newton's 1st Law | An object at rest remains as rest and an object in motion remains in motion at a constant speed and in a straight line unless acted on by an unbalanced force. |
| Newton's 2nd Law | The acceleration of an object depends on the mass of the object and the amount of force applied. |
| Newton's 3rd Law | When one object exerts a force on a second object, the second object exerts an equal and opposite force on the first. |
| Inertia | The tendency of an object to resist being moved -- or, if the object is moving, to resist a change in speed or direction until an outside force acts on it. |