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How do I setup an equation for the acceleration constraint?

  1. Nov 30, 2009 #1
    1. The problem statement, all variables and given/known data
    ygzvcfv.png

    3. The attempt at a solution
    Could someone explain how to setup an equation for position so that I can find an acceleration constraint?
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Nov 30, 2009 #2

    ehild

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    The constraint here is the constant length of the string. What relation does it mean between xa and yb?

    ehild
     
  4. Nov 30, 2009 #3
    I see that

    L = 2x_a + y_b + C

    The problem comes when I try to put that in terms of something I can differentiate. How would you do it?
     
  5. Nov 30, 2009 #4

    ehild

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    You can differentiate both sides of this equation. What is the differential quotient of a constant? and what is the relation of the velocities and accelerations to the first and second time derivatives of xa and yb respectively?

    ehild
     
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