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Homework Help: Constained Motion

  1. Oct 21, 2009 #1
    http://img101.photolava.com/2009/10/21/engr-vswpt7nk.jpg [Broken]
    An old exam paper practice question. I can get up to b) but i am having trouble with the tensions.

    I got for Aa=-10mms-2 Ad=-5mms-2, while Ac is given to be 20mms-2 and Ab=0mms-2.
    Is this corrent and if so how do I go about solving question c?

    This was done by creating the constraints.
    2Aa + 2Ab + Ac = 0
    2Ad - Aa - Ab = 0
    Last edited by a moderator: May 4, 2017
  2. jcsd
  3. Oct 21, 2009 #2


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    Welcome to PF!

    Hi makeez! Welcome to PF! :smile:

    (question c is the tension in the strings)

    Start with good ol' Newton's second law for mass C … Fnet = ma :wink:
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