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Homework Help: Question about kinematic equation

  1. Dec 1, 2011 #1
    Assuming initial angular velocity is 0 I want to solve for final position theta

    Ang Acceleration = Δw/Δt = w/t

    w = Δ(theta)/Δt = theta/t

    ang acc = theta/t^2

    theta = (ang acc)(t^2)

    but how come the kinematic equation is...theta = (ang acc)t^2/2

    Where did my 2 go?
  2. jcsd
  3. Dec 1, 2011 #2


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    this formula gives the average angular velocity. You are looking for the instantaneous final angular velocity, which is twice the average.
    The displacement theta is {(wo+wf)/2} (t)
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