Gravity - Research Article from Macmillan Science Library: Space Sciences

Leanne Lieberman
This encyclopedia article consists of approximately 4 pages of information about Gravity.
This section contains 1,195 words
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Newton's Law of Universal Gravitation

In 1687, English physicist and mathematician Isaac Newton examined the laws of motion and universal gravitation in a classic text, The Principia, making it possible to explain and predict the motions of the planets and their newly discovered moons. Gravity is not just a property of Earth but of any matter in the universe. The essence of Newton's law of universal gravitation is demonstrated by imagining a "point mass," which is a certain amount of matter concentrated into a space of virtually zero volume. Now, suppose there is another point mass located some distance away from the first mass. According to Newton, these two masses mutually attract one another along the straight line drawn directly between them. In other words, the first mass feels a "pull" towards the second mass and the second mass feels an equal amount of "pull" towards the first. Of course...

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This section contains 1,195 words
(approx. 4 pages at 300 words per page)
Buy the Gravity Encyclopedia Article
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Macmillan Science Library: Space Sciences
Gravity from Macmillan Science Library: Space Sciences. Copyright © 2001-2006 by Macmillan Reference USA, an imprint of the Gale Group. All rights reserved.
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