| A | B |
|---|
| Centripetal Acceleration | Acceleration towards the center of a circular path. |
| Gravitational Force | An attractive force that exists between all objects. |
| Kepler's Laws | Laws that describe the motion of planets and satelites. |
| Weightlessness | The apparent loss of gravitational force on an object in orbit or in freefall. |
| Gravitational Field | The area around a mass that acts on other masses, causing them to be attracted to each other. |
| Kepler's First Law | The sun is at the focus of the eliptical path of a satellite. |
| Freefall | Accelerating downward because on an unbalanced gravitational force. |
| G | Universal Gravitational Constant |
| Universal Gravitational Constant | Needed to calculate the force between to objects. |
| Black Hole | An extremely massive object that can bend light back tot he object. |
| Inverse Square Law | A relationship in which one variable is inversely proportional to the square of another variable. |
| Law of Universal Gravitation | The attraction between two bodies depends on the masses of the two bodies and the distance between their centers. |
| General Theory of Relativity | Einstein's theory that mass causes space to be curved. |
| Kepler's Second Law | Satellites speed up as they get closer to the sun. |
| Period | The time for one revolution. |
