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Gravity supplies the necessary centripetal force to hold a satellite in orbit about the earth. The circular orbit is a special case since orbits are generally ellipses, or hyperbolas.
Orbit simulator software for school and college students and teachers. The orbit simulator allows laboratory exercises on gravitational physics, elliptical orbits, double stars, escape velocity, ...
Section of the excellent hyperphysics site dealing with orbits and the concepts connected to this.
Detailed analysis of geostationary orbits, includees diagrams and the original 1945 description from Arthur C Clarke.
Student selects satellite velocity to try to keep satellite in earth orbit
Orbits in gravitational fields
A simulation to show how gravity affects orbits
This site takes you through the calculation of an orbit velocity.
Definition of a geostationary orbit with some accompanying calculations.
An elementary quiz based on the position and orbits of the planets.
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