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Homework Help: Energy of a free-falling, pivoting thin rod

  1. Apr 1, 2009 #1
    1. The problem statement, all variables and given/known data
    The thin uniform rod in Figure 10-59 has length 4.0 m and can pivot about a horizontal, frictionless pin through one end. It is released from rest at angle θ = 40° above the horizontal. Use the principle of conservation of energy to determine the angular speed of the rod as it passes through the horizontal position.

    2. Relevant equations

    3. The attempt at a solution
    I don't really know.
  2. jcsd
  3. Apr 1, 2009 #2


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    Gold Member

    There will be two kinds of kinetic energy you'll have to find and add together: rotational and translational. Recall your basic equations of linear and rotational motion.
  4. Apr 1, 2009 #3
    I'm sorry, but the the problem is that the fact that it's pivoting causes me hesitation with the linear equations of motion. Could you (or someone) be more specific as to how I should apply these equations?
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