| A | B |
|---|
| Free fall | The condition an object is in when gravity is the only force acting on it |
| Orbiting | This occurs when an object is traveling in a circular or nearly circular path around another object |
| Projectile motion | The curved path an object follows when thrown or propelled near the surface of the Earth |
| 9.8 m/s/s | Acceleration rate of all objects falling to the Earth |
| Air resist./fluid friction | The force that opposes the motion of objects falling through the air |
| In a vacuum | The only place free fall can occur |
| Gravity | The only force acting on an object when it is in free fall |
| Examples of projectiles | Arrows, leaping frogs, water sprayed from a sprinkler |
| Terminal velocity | The constant velocity of a falling object when the amount of upward force of air resistance matches (equals) the amount of the downward force of gravity |
| Forward motion & free fall | The two motions that form an orbit |
| Centripetal force | This causes orbiting objects to change direction |
| Horizontal & vert. velocities | The two motions that combine to form projectile motion |
