Newton's Law of Universal Gravitation

Ackerman's Take on Crease's Treatment of the Equation:

Web Resources:

Physics Classroom has a several-page summary of universal gravitation.

The PhET Simulations include this fun and illustrative simulation.

Demonstrations of the Equation:

These files will open using Mathematica Player, a free program that can be downloaded here.

Inverse Square Laws -- According to Newon, Gravity varies by the inverse of the square of radius.

Work in Gravitational Field -- Measurements of familiar quantities can be unusual in gravitational fields.

Explore gravitation in this interactive lab.

Video:

A 5-minute explanation of universal gravitation complete with demonstrations.