Col. Terry Virts (USAF) is an astronaut currently serving on the International Space Station. Chapple's Dictionary of Physics defines centripetal force as "a force that acts at right angles to a body's path and so constrains the body to follow a circular path about the point to which the centripetal force acts." That's a circle, which Col. Virts demonstrates nicely in zero gravity using a chain.
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http://www.youtube.com/watch?v=lis6crVUYVw
arc flashs are terrifying
http://www.youtube.com/watch?v=5NNOrp_83RU
In other words, think of all the times the sidewalk didn't explode.