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Static Equilibrium

  1. Dec 15, 2014 #1
    1. The problem statement, all variables and given/known data
    I have a question about the following question:

    upload_2014-12-15_20-2-23.png

    Firstly, shouldn't there be a normal force for each hand (part a), but here they treat it as one normal force.

    Also in part b, why isn't the torque for Fn1h = 0? Since that is the pivot point, isn't the moment arm zero?
     
  2. jcsd
  3. Dec 15, 2014 #2

    Simon Bridge

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    How is the result different if you give each hand a separate normal force?

    ##F_{N1} \neq 0## and ##h\neq 0## therefore ##F_{N1}h \neq 0## ... take a closer look: what are they using for the pivot point in that calculation?
     
  4. Dec 15, 2014 #3
    Wow. The pivot point is the location of the foot and N1 is for the hands. I see. Thank you.
     
  5. Dec 15, 2014 #4

    Simon Bridge

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    Well done. Remember all those horizontal mean static problems - beam between two supports?
    Remember how you'd do a sum-of-torques for each support as the pivot?
     
  6. Dec 15, 2014 #5
    I actually don't know what you're referring to as I am learning torque and rotational dynamics on my own (on my final exam tomorrow and my teacher rushed everything on rotation ) - I don't think I've come across a problem like that
     
  7. Dec 15, 2014 #6

    Simon Bridge

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