video C1: The Gravitational Field Strength.  This video is on the gravitational field due to a planet.

video C2: Satellites in Circular Orbit.  This video details the physics of satellites in circular orbit around another object.

video C3: Kepler's 3 Laws of Planetary Motion.

video C4: Elliptical Orbits and the Conservation of Energy

video C5: Elliptical Orbits and the Conservation of Angular Momentum

Video C6: Escape Velocity.  explains how you calculate an object's escape velocity for a given planet.

video C7: The Physics of Binary Star Systems

video C8: Review for Unit C (part 1).  This video is a review of the concepts covered in unit G on Planetary or Satellite Motion.  Try pausing the video after each question to see if you can answer the question on your own. 

video C9: Review for Unit C (part 2)

video C10: Review for Unit C (part 3)