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Homework Help: Help understanding centrefugal force

  1. Oct 26, 2011 #1
    1. The problem statement, all variables and given/known data

    Basically i have to prove a lagrange equation using a non-inertial reference frame. A bead on a hoop where the hoop rotates as in the image below.


    F = Fg + Fcf

    2. Relevant equations

    mR(d2θ/dt2) = mΩ2Rcosθsinθ -mgsinθ

    what i'm supposed to get

    3. The attempt at a solution

    Fg = -mgsinθ

    Fcf = m(ΩxR)xΩ = mΩ2Rcosθsinθ

    I know that

    Ω = Ω(0 , sinθ, cosθ)

    R = R( 0 ,

    k i'm just lost and frustrated :(
  2. jcsd
  3. Oct 28, 2011 #2
    This is probably late but does this work?

    Attached Files:

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