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Statics: Rigid Body Equilibrium

  1. Mar 30, 2013 #1
    Hello, I was wondering if someone could explain part of the solution to this problem for me.

    http://img706.imageshack.us/img706/5517/disksproblem.png [Broken]

    To the right is the Free Body Diagram of Disk E, and I can draw the forces on there well enough. But I really do not understand how they obtained that triangle for N' (1-5-√24). I know this is the force of disk D acting on disk E, but that's about it.
    Last edited by a moderator: May 6, 2017
  2. jcsd
  3. Mar 30, 2013 #2


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    When two circles touch, the point of contact lies on a line joining the centers of the two circles. Using the two radii and some geometry, you can derive the components of the N' vector.
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