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Homework Help: Angular acceleration without rotation?

  1. Mar 4, 2012 #1
    If rod BD is fixed at collar C, it is not rotating, correct? Why is the angular acceleration being asked if it's not rotating?
  2. jcsd
  3. Mar 5, 2012 #2
    It's not fixed at collar C, it's sliding through it. It if were fixed, there would be 0 degrees of freedom, and OB could not be rotating.
  4. Mar 5, 2012 #3
    it also looks like the collar can rotate at point C
  5. Mar 5, 2012 #4
    This is also a kinematics problem, not an introductory physics problem, and involves using relative velocities.
  6. Mar 5, 2012 #5
    Nevermind, it is rotating. Thanks!
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