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Is the bar in static equilibrium?

  1. Nov 24, 2013 #1
    1. The problem statement, all variables and given/known data
    sample2.png

    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

    F-uk*Fn


    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

    haruspex

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    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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