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Homework Help: Is the bar in static equilibrium?

  1. Nov 24, 2013 #1
    1. The problem statement, all variables and given/known data

    uk of fraction between bar and both surfaces is 0.2. Bar weighs 5 kg.

    i) Is the bar in static equilibrium? If not, which end will fall down and which end will go up?

    2. Relevant equations


    3. The attempt at a solution

    Not sure how to even begin analyzing this. I cannot visualize the bar moving in either direction first. Any guidance is appreciated.
  2. jcsd
  3. Nov 25, 2013 #2


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    Science Advisor
    Homework Helper
    Gold Member

    Invent variables for the normal forces at the two ends. (Use different names.) Write the usual horizontal and vertical statics equations for the bar and one for torque. Use a symbol for the angle - don't plug in any numbers until the final equation.
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