Magnetic Guillotine!!!

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K&J Magnetics shows off their new Eddy Current invention...a magnetic guillotine! The aluminum blade reaches a speed of over 10 MPH before the magnets slow it down to just 0.03 MPH! We bet King Henry wishes he had some powerful magnets to do this...
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I love how non ferrous metals react with strong magnets. It always amazes people when I show them how a magnet is slowed down by a copper or aluminum plate or tube.
What exactly is the scientific explanation for this?

norseaknothead