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Ideal entities

  1. Feb 9, 2010 #1


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    Staff: Mentor

    In this thread mgb listed massless springs and friction free slopes. That made me think - what other idealized entities (not sure of that's the best selection of word, feel free to correct/edit) do we use in physics? Other things that I can think of just off the top of my head are point masses, massless strings and rods, ideally elastic strings, ideal black body, zero internal resistance batteries.

    Your favorite?
  2. jcsd
  3. Feb 9, 2010 #2
    Containers with zero heat capacity
    Pendulums that actually perform SHM (the theta = sine theta trick!)
    Ideal gasses
    "Thin" lenses shown as having no thickness in ray diagrams
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