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Homework Help: Angular Accelaration = Angular Velocity^2 ?

  1. Jan 6, 2010 #1
    Angular Accelaration = Angular Velocity^2 ???

    1. The problem statement, all variables and given/known data
    Can we always says angular accelaration is equal to angular velocity^2? My friend said that i was wrong when think like that to solve question?


    2. Relevant equations
    Accelaration = -(angular velocity)^2 X Radius

    Acceleration = Radius X Angular Accelaration


    3. The attempt at a solution
    When i solve those two equations together i get what i hougt. Is there any problem with that? If any please let me know where? Thanks.
     
  2. jcsd
  3. Jan 6, 2010 #2

    Doc Al

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    Staff: Mentor

    Re: Angular Accelaration = Angular Velocity^2 ???

    You are mixing up angular acceleration, centripetal acceleration, and tangential acceleration:
    This relates centripetal acceleration to angular velocity:
    Centripetal acceleration = ω²R

    This relates tangential acceleration to angular acceleration:
    Tangential acceleration = αR
     
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