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Kepler's laws, Newton's law of gravitation

Kepler's laws

1.The orbit of a planet is an ellipse with the Sun at one focus of the ellipse.

2.A planet revolving about the Sun sweeps out equal areas in equal time intervals.

3.The square of the period of a planet is proportional to the cube of the semi-major axis of its ellipical orbit.

Newton's law of gravitation states that the gravitational force of attraction between two bodies is proportional to the product of their masses and inversely proportional to the square of the distance between them.


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Historical sketch: Johannes Kepler


Copyright © 2006 Darel Hardy, Fred Richman, Carol Walker, Robert Wisner. All rights reserved. Except upon the express prior permission in writing, from the authors, no part of this work may be reproduced, transcribed, stored electronically, or transmitted in any form by any method.

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