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Question about pulley with relative motion

  1. Oct 31, 2012 #1
    v48021i223.png

    for part(i) the answer is g/4 + g/2 = 3g/4 ms^-2
    how to calculate the acceleration of the 9N blcok relative to the small pulley to be g/4??
    Did I miss something?
    thank you so much!!o:)
     
  2. jcsd
  3. Oct 31, 2012 #2

    SammyS

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    The small pulley has rotational inertia. Therefore, the tension on the string supporting the 3N particle is different than tension on the string supporting the 9N particle.
     
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