Video by Dr. Peter McLewin today, as he captured the giant pendulum at the Greensboro Science Center. This enormous Foucault pendulum hangs 40 feet high, with a 240lb brass ball that swings over 9 foot arc each day. Once set in motion, the pendulum cannot change its direction or rate of swing unless pushed by an external force. The earth, however, rotates at a speed equivalent to 1,000 miles per hour, resulting in the pendulum knocking over another peg every 15 minutes. This pendulum was Install

Foucault's Pendulum Physical Experiment

The Device That Lets You See The Earth Turn: The Foucault Pendulum