In this edition of IDTIMWYTIM, Hank addresses the so-called centrifugal force, and explains why you really mean centripetal force.
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References for this episode:
http://www.lhup.edu/~dsimanek/glossary.htm
http://phun.physics.virginia.edu/topics/centrifugal.html
http://www.newton.dep.anl.gov/askasci/phy00/phy00305.htm
