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Homework Help: Angular velocity, acceleration, and torque

  1. Jun 23, 2013 #1
    Hello, can anyone explain why the direction of angular velocity, acceleration, torque, and momentum point perpendicular to the rotation of the circle? It seems to make more sense if it pointed in the tangential direction.
  2. jcsd
  3. Jun 23, 2013 #2


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    What actual circle is rotating here, and is it rotating like a merry-go-round or like a coin spinning on its edge?
  4. Jun 23, 2013 #3


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    By using a vector perpendicular to the plane of some angular quality, the math is simpler since normal vector math can be used, and a vector provides sufficient information, direction and magnitude.
    Last edited: Jun 23, 2013
  5. Jun 23, 2013 #4
    a merry go around like circle
  6. Jun 23, 2013 #5

    D H

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    What tangent? It's a merry go round. There is no one tangent.
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