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Homework Help: Angular motion

  1. Dec 9, 2004 #1
    we are just about to take a test in physis.. im quite scared. i have revised on all the topics required but i dont get the use of omega in angular velocity equations. what is the equation and when do i need to use it?
    sarah
     
  2. jcsd
  3. Dec 9, 2004 #2
    well - u can take ur normal kinematics equation and replace v with omega.
    like....

    [tex]
    \theta = \theta_0 + \omega t + \alpha t
    [/tex]

    alpha is the angular acceleration.
     
  4. Dec 9, 2004 #3
    Just learn

    v=rw

    w= 2.pi.f = 2.pi / T

    f = 1/T =w / 2.pi

    a = v^2/r = rw^2

    F=mv^2/r = mrw^2
     
  5. Dec 9, 2004 #4
    Replace v by [tex]\omega[/tex]

    a by [tex]\alpha[/tex]

    and x by [tex]\theta[/tex]

    in your kinematics equations to get the rotational equations!

    [tex]\omega = \omega_0 + \alpha t[/tex]
    [tex]\theta = \theta_0 + \omega_0 t + \frac{1}{2}\alpha t^2[/tex]
    [tex]\omega^2 = \omega_0^2 + 2\alpha\theta[/tex]

    And the Equations posted by Briton are also very important
     
    Last edited: Dec 9, 2004
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