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Difference between Rotation Inertia of Rod V.S Cylinder

  1. Dec 6, 2015 #1
    A rod and Cylinder with a same axis of rotation relative to its body have different rotational inertia equation. WHY?

    Thanks in advanced.
     
  2. jcsd
  3. Dec 6, 2015 #2
    The rod is assumed to have negligible radius. It is assumed to be a straight line having a fixed mass. In case of a cylinder, it has a radius hence its moment of inertia is different from that of a rod.
     
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