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I Dynamically balance and angular momentum

  1. Jun 12, 2016 #1
    https://en.wikipedia.org/wiki/Balancing_of_rotating_masses

    See the image in that page.

    I know intuitively why a direction of torque is counterclockwise-because of a centrifugal force.

    But an direction of angular momentum of that shaft with attached weights (ignore the shaft mass) is southeast direction.

    And a torque of that body is an inward of page, which means clockwise direction.

    Why I gets this conclusion???? somebody help me.
     
  2. jcsd
  3. Jun 12, 2016 #2

    Simon Bridge

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    It is not clear what you are trying to calculate from what, how?
    What is your reasoning?

    Some notes:
    angular momentum points along the rotation axis
    torque is rate of change of angular momentum ...
     
  4. Jun 13, 2016 #3
    the direction of angular momentum of that body is southeast direction.

    and because of rotation, angular momentum rotates inward direction of page.

    so, that means direction of torque(=chage of angular momentum) is clockwise.

    but the wiki page said that the torque's direction is counterclockwise.

    i cant understand wiki conclusion by reasoning - torque direction is clockwise.


    ps from note
    angular momentum points along the rotation axis - you means that shaft?
     
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