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Foucault Pendulum Question

  1. Sep 22, 2008 #1


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    Can somebody explain to me why it doesn't matter that whatever structure from which a Foucault Pendulum is suspended is also rotating along with the Earth? How come the pendulum's plane of oscillation is not altered?

    Wikipedia sort of has an answer, but to me it seems to amount to little more than a claim that it doesn't matter:

  2. jcsd
  3. Sep 23, 2008 #2

    Vanadium 50

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    The pendulum's support can't put a very large torque on the swinging pendulum system, as the lever arm is almost zero.
  4. Sep 23, 2008 #3


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    Note that the ball will rotate. It's just the plane of motion that doesn't rotate.
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