Physics Classroom
The Physics Classroom: Cavendish and the Value of G
A short description of how Cavendish measured the value of G - the universal gravitation constant and supported Newton's theory. Illustrated.
NASA
Nasa: The Rocket Motor
An online version of a book pertaining to task of launching rockets into space and subsequently navigating them through space. The first several "chapters" (pages) describe the influence of gravity on Earth and the barriers which it...
University of St. Andrews (UK)
University of St. Andrews: Isaac Newton (1643 1727)
This life of Isaac Newton' traces his life from birth through childhood to his rise as a renown scientist and mathematician.