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The Acceleration of a Sliding Collar on a Shaft

  1. Dec 14, 2016 #1
    1. The problem statement, all variables and given/known data

    For the mechanism shown, determine the speed and magnitude of the acceleration of collar C in terms of b, θ, θ-dot, and θ-dot-dot.

    Check the attached file for the diagram.

    We are given the length b and angle θ.


    2. Relevant equations

    ΣF=ma

    3. The attempt at a solution

    I started conceptualizing this problem right now. However, I don't even know where to start. The mechanism moves in such a way that θ 'closes' to 0 (since the whole thing falls). But how would I go about describing that in terms of 'b' ? It'd be dope to get some help/hints :) I'll post my work as the discussion develops. Thank you :)
     

    Attached Files:

  2. jcsd
  3. Dec 16, 2016 #2

    BvU

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    Hello Ernesto, :welcome:

    "Don't know where to start" doesn't pass the PF guidelines :rolleyes:
    I'll get chastized for answering anyway instead of pressing the 'report' button :nb).

    What coordinate system would be the most convenient ?
    How do you express the position of C in terms of ##b## and ##\theta## ?
     
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