## Gravitation

- Newton's Law of Gravitation
- Lecture (10:21)
*Discussion of Newton's Law of Gravitation*

- Weight & Apparent Weight
- Lecture (10:17)
*Calculating weight on the Earth's surface from Newton's Law of Gravitation, the acceleration due to gravity, and the correction to the apparent acceleration due to the rotation of the Earth*

- Gravitational Potential Energy
- Lecture (13:04)
*Gravitational potential energy close to the Earth's surface, and for distances comparable to the radius of the Earth. *

- Motion of Satellites & Orbital Velocity
- Lecture (7:04)
*Application of gravitational potential energy to find the orbital velocity of a satellite in near-Earth orbit*

- Escape Speed
- Lecture (10:08)
*Application of gravitational potential energy to find the escape speed from Earth and from the Sun*

- Kepler's First Law
- Lecture (6:41)
*Discussion of Kepler's First Law which says that all planets travel in elliptical orbits*

- Kepler's Second Law
- Lecture (9:27)
*Discussion of Kepler's Second Law and explanation in terms of angular momentum conservation*

- Kepler's Third Law
- Lecture (12:00)
*Discussion of Kepler's Third Law and explanation in terms of Newton's Law of Gravity. Application to find the period of a lunar orbit*