7.3 Universal Gravity and Kepler's Laws of Motion
Gravity and Gravitational Potential Energy
| GRAVITY AND GRAVITATIONAL POTENTIAL ENERGY | ||
|---|---|---|
| Surface of the Earth | Anywhere | |
| GravitationalForce |  |  |
| GravitationalPotential Energy |  |  |
| Escape Speed |  | |
| KEPLER'S LAWS | |
|---|---|
| 1st Law | Planets have elliptical orbits with the Sun as one of the focal points. |
| 2nd Law | The line between the sun and a planet sweeps out equal areas in equal intervals of time.  |
| 3rd Law | The square of the period of a planet’s orbit is proportional to the cube of its average distance from the sun.  |