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centripetal vs. centrifugal force

[ sen-trip-i-tl ]
  1. directed toward the center (opposed to centrifugal).
  2. operating by centripetal force.
  3. afferent.
  1. an outward force on a body rotating about an axis, assumed equal and opposite to the centripetal force and postulated to account for the phenomena seen by an observer in the rotating body.

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