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Moment of Inertia confusion

  1. Oct 27, 2013 #1
    1. The problem statement, all variables and given/known data

    Small blocks, each with mass m, are clamped at the ends and at the center of a rod of length L and negligible mass

    Compute the moment of inertia of the system about an axis perpendicular to the rod and passing through a point one-fourth of the length from one end.

    2. Relevant equations

    I = Mr2

    What im having difficulty with

    I dont understand where this axis is, it would help if someone would explain or better draw a diagram to help me understand.
  2. jcsd
  3. Oct 27, 2013 #2

    Doc Al

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    Staff: Mentor

    Did you try drawing a diagram for yourself? The directions seem pretty straightforward.

    Draw a line representing the rod. Now draw a line perpendicular to it. If it that perpendicular line were in the middle of the rod, it would be 1/2 the length from one end. Move it so that it's 1/4 the length from one end.
  4. Oct 29, 2013 #3


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    Do you agree that one-fourth of the rod length, as measured from one end, must be midway between that end and the center point?
  5. Oct 29, 2013 #4
    Sorry, i figured it out before everyones reply, so im all good. Thanks for the help though
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