Cavendish Gravity Mass Experiment: Use this interactive on Cavendish Torsion Bar experiment to demonstrate how mass affects gravity.Newton's Law: Offers a discussion in simple language. Includes jokes as well as explanation of gravitational formula.The Pendulum Lab: A virtual laboratory focused on hands-on experiments at rigid pendula. Includes explanatory text.What Comes Up Must Come Down: Discover the concept of gravity, what it is, and how it works. Find out who uncovered this concept and why gravity is more than just a 'matter of attraction.'Your Weight on Other Worlds: From the Exploratorium, an interactive calculator that will determine a person's weight on another planet.