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Static Equilibrium Question

  1. Feb 7, 2017 #1
    1. The problem statement, all variables and given/known data

    If the load on the uniform beam shown below is moved to the left, how do the tension force T and the magnitude of the vertical force Fv exerted by the wall on the hinge change?

    The answer is A
    2. Relevant equations
    torque = Fdsin(theta)

    3. The attempt at a solution
    My equation was Tsinx = fd. I understand when the object is moved to the left the distance decreases, and the angle decreases, but I don't understand how the vertical force increases exerted by the wall


    Also for the 2nd question ( the ladder one) why is the answer B? What I thought was Fgdcos theta = FN2(d)(cos theta) + FN1(d)(cos theta), so when the distance for FN1 increases wouldn't the force increase too?
     

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    Last edited: Feb 7, 2017
  2. jcsd
  3. Feb 8, 2017 #2

    haruspex

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    What angle decreases? As I read the question, only the load is moving. The cable stays put.
     
  4. Feb 8, 2017 #3

    haruspex

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    I cannot understand your notation. Is this a force equation or a moment equation? What is Fgd? Is FN2(d) the force FN2 as a function of d, the distance up the ladder, or is it a force multiplied by a distance?
    (You will need to consider moments to answer the question.)
     
  5. Feb 8, 2017 #4
    Oh I meant Fg(d) and it's for the torque equation
     
  6. Feb 8, 2017 #5

    haruspex

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    Ok. What point are you taking moments about?
    You seem to be using the same d for different distances and the same θ for different angles.
     
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