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Measure the max angle of a 3D pendulum

  1. Jun 1, 2018 #1
    Hi, I need a simple way to measure the maximum angle/vertical displacement of a 3D pendulum (weight hanging from a rope) undergoing random impacts. What will work?
  2. jcsd
  3. Jun 1, 2018 #2


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    Staff: Mentor

    Whelp, you could buy a $50,000 3-D camera measurement system and software, or you could use your hand and a tape measure. What's your pleasure?
  4. Jun 3, 2018 #3


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    Science Advisor

    Let the rope pass through a hole in a table. Place a radial array of flat rulers on the table. They will be pushed away by the pendulum rope. Read the distance they are pushed, with y = height of fulcrum above the table, and x = maximum push of ruler, theta = Atan( x / y ).

    See; https://en.wikipedia.org/wiki/Ballistic_pendulum
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