1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Tensions and Constraints

  1. Oct 21, 2009 #1
    Hi All

    1. The problem statement, all variables and given/known data
    http://img101.photolava.com/2009/10/...r-vswpt7nk.jpg [Broken]
    Ac is given to be 20mms-2 and Ab=0mms-2.
    The masses of A C D are 10kg

    2. Relevant equations



    3. The attempt at a solution
    I found the following constraints by differentiating distance constraints of the rope.
    2Aa + 2Ab + Ac = 0
    2Ad - Aa - Ab = 0
    I solved these simultaneously to get the acclerations
    Aa=-10mms-2 Ad=-5mms-2, while
    Is this corrent and if so how do I go about solving question c?
    I tried summing the forces around blocks but my answers where inconsistant depending on which block I used, for example on block c ma=Tension of rope ABC - mg
    or on block a ma = 2*tension of rope ABC - tension of rope ABD - mg
    or on block d ma = 2*tension of rope ABD - mg.
    what am I doing wrong?
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
    Last edited by a moderator: May 4, 2017
  2. jcsd
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Can you offer guidance or do you also need help?
Draft saved Draft deleted



Similar Discussions: Tensions and Constraints
  1. Equation of Constraint (Replies: 1)

  2. Constraint relations (Replies: 1)

  3. Constraint equations (Replies: 2)

Loading...