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Homework Help: How to draw a freebody diagram of a non ideal pulley

  1. Apr 21, 2009 #1
    1. The problem statement, all variables and given/known data
    Just a quick question. Im not entirely sure how to draw an FBD of a pulley with Inertia.

    Im doing a problem solving excercise for the atwood machine with two masses over a non ideal pulley and need to sketch its FBD.

  2. jcsd
  3. Apr 21, 2009 #2

    Doc Al

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    Staff: Mentor

    The important thing to show on a FBD of the pulley are the two rope tensions acting on it, since they are the only forces creating a torque on the pulley (assuming no friction). The key is that each side of the rope will have its own tension, so call them T1 and T2.
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