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Zero Gravity Physics Lesson

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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