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Experiment with a neodymium magnet pendulum. The magnet passes abovevery near a block of wood and a block of aluminum. Because of the eddy currents generated on the aluminum block the movement of the magnet is damped until the magnet is braked.
http://en.wikipedia.org/wiki/Eddy_current_brake http://en.wikipedia.org/wiki/Electromagnetic_brake http://www.railwaygazette.com/news/single-view/view/eddy-current-braking-a-long-road-to-success.html http://en.wikipedia.org/wiki/Regenerative_brake http://en.wikipedia.org/wiki/Retarder_(mechanical_engineering)

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