Physics Classroom
The Physics Classroom: Circular and Satellite Motion: Gravitational Fields
Students discover the Law of Universal Gravitation by changing the masses of planets and moons and the distance that separates them.
Physics Classroom
The Physics Classroom: Kepler's Three Laws
The three laws of planetary motion as described by Kepler are stated and elaborated upon. Useful graphics and an easy-to-understand language are used to explain the nature of planetary motion. Both conceptual and mathematical. Includes a...
CK-12 Foundation
Ck 12: Plix: Orbital Motion: Distance
[Free Registration/Login Required] The meteor is orbiting one of the 3 planets in a circular orbit. Drag the point associated with each planet to the meteor to see its orbit around that planet.