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centripetal force vs. centrifugal force

noun
  1. the force, acting upon a body moving along a curved path, that is directed toward the center of curvature of the path and constrains the body to the path.
noun
  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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