| A | B |
|---|
| Trajectory | Path an object takes when moving in a gravitational field |
| Component | Part of a vector in a specified direction |
| Gravitational Field Strength | Force acting per unit mass on a small test mass |
| Newton's law of Gravitation | a mass is attracted to another mass with a force proportional to the product of the masses and inversely prportional to the square of the separartion. |
| Gravitational Potential | Energy per kilogram a test mass would have a postion in a gravitaional field compared with zero at infinity |
| Gravitational Potential Energy | Energy needed to move an object from infinity to a position in a gravitational field. Since in infinity is defined as zero |
| Escape Speed | Minumum speed needed to completely escape a gravitational field from a specified position |
| Kepler's third law | For objects in orbit around a common center |
| Orbit | Stable path an object takes around another object |
| Weightless | Sensation of no gravity |
| Static friction | Force that can arise between two surfaces parallel to the surfaces when an applied force tries to move the object. |
| Dynamic Friction | Force that acts between two surfaces parallel to the surfaces that opposes motion. |
| Coefficient of friction | Ratio of normal force to (maximum) friction force |
| Torque | Turning effect of a force |
| Moment | Used synonymously with torque |
| Translational equilibrium | Showing no acceleration in any given direction. May be but not necessarily stationary. |
| Rotational equilibrium | Showing no angular acceleration |
| Center of Gravity | Point from or at which all the mass of an object can be considered to be acting. |
