Minute Physics: What is Gravity?

Crash Course: Newtonian Gravity

Professor Dave Explains: Universal Gravitation

Wired: Gravity Explained

NASA Science: Solar System Dynamics

Socratica: Kepler's First Law of Motion

Crash Course Astronomy: The Gravity of the Situation

Socratica: Kepler's Second Law of Motion

Socratica: Kepler's Third Law of Motion

Great Moments in Science and Technology: Tycho Brahe, Johannes Kepler and Planetary Motion