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Bifilar pendulum experiment

  1. Sep 25, 2015 #1
    Bifilar pendulum, data matches the theory real neat. Do have a question, I would expect the period to match the period of a torsional pendulum for the limit when the support strings are the same point ie zero separation.

    I can't get the bifilar equation to reduce to the torsion equation for said limit. Any clues?
  2. jcsd
  3. Sep 25, 2015 #2


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    if the 2 pendulum strings are attached at the same point, it has become a simple ball-on-string pendulum.
    (the bifilar's ball motion is the same as for a single string, if the string is shorter.)
    A torsional pendulum's Restoring Force is caused by a thick support's rotational elasticity, rather than gravity.
  4. Sep 25, 2015 #3
    Not aware of the ball on string problem, google gave ambiguous results. Do you have link?
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