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I have a big question . (Dynamics-Parallel Velocities)

  1. Nov 21, 2014 #1
    In this problem why it is not considered that the bar is in translation (angular velocity = 0) if at the time when the angle is 0 °, the velocities at each point of the rod are parallel??
    upload_2014-11-21_18-1-41.png
     
  2. jcsd
  3. Nov 21, 2014 #2

    jack action

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    They might be parallel, but they don't necessarily have the same magnitude.
     
  4. Nov 21, 2014 #3
    Your comment made me realize that to affirm that the angular velocity is zero, must be checked with a relative velocity analysis, in this case Vab = Va + V b / a; (Vab) x (i) + (Vab) y (j) = Va (i) + [w (k) x (L / 2 (j))] where simplification is that (Vab) y = 0; (Vab) x = Va + (wL / 2); where it exists angular velocity.

    Thank You!
     
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