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Rod is toppling. Find reaction force as a function of theta

  1. Dec 20, 2016 #1
    1. The problem statement, all variables and given/known data
    Rod of length b and mass m topples from vertical position at theta = 0. Calculate the reaction force f as a function of theta. What is the minimal and maximal values of f for theta between 0 and pi

    2. Relevant equations
    Third law?



    3. The attempt at a solution
    I never really worked a problem such a this in mechanics. So I was shocked to see this on my exam. I would like to know what the solution is. I had no idea how to solve. I suppose this falls under rigid body motion, but all we worked in that topic were lagrangians.....
     
  2. jcsd
  3. Dec 20, 2016 #2
    can the rod slip on the ground?
     
  4. Dec 20, 2016 #3

    BvU

    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    In general, exam questions are related to the material that's been presented. So you wrote a Lagrangian for this constrained system and found the equation of motion. Did you also learn that the constraint forces follow from the Lagrangian multipliers ?
     
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