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Another Torque question

  1. Dec 26, 2006 #1
    1. The problem statement, all variables and given/known data[
    A bridge of length L=72 m and mass 64000 kg is supported at each end. A truck of mass 20000kg is located at x=29m from the left support. Calculate the normal force at each support.

    2. Relevant equations
    T=F x sinx

    3. The attempt at a solution
    Is the normal force the same as the tension?
  2. jcsd
  3. Dec 26, 2006 #2


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    Homework Helper

    I'd assume the 'normal' force at the support is the 'vertical' force, i.e. the statical force acting as a reactive force at the support.
  4. Dec 26, 2006 #3
    think of each support as different possible origins of your system. Then figure out the upward force necessary to keep the sum of torques equal to zero.
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