#pendulum  an apparatus consisting of an object mounted so that it swings freely under the influence of gravity
  supertype:  #apparatus.equipment__apparatu__setup  equipment designed to serve a specific function
  subtype:  #Foucault_pendulum  #metronome  #physical_pendulum  #simple_pendulum
  part:  #bob.weight  a hanging weight, especially a metal ball on a string

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