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Do friction forces exist?

  1. Mar 21, 2009 #1
    1. The problem statement, all variables and given/known data
    http://picasaweb.google.com/lh/photo/ChOBWTwVEO3hI0wtftmdmw?feat=directlink [Broken]
    A rigid rod is put in a global bowl horizontally.The bowl is shaggy.Do friction forces exist where the rod and the bowl touch?
    2. Relevant equations



    3. The attempt at a solution
    If the bowl is smooth,it's clear that friction forces don't exist.But what if the bowl is not smooth?
     
    Last edited by a moderator: May 4, 2017
  2. jcsd
  3. Mar 21, 2009 #2

    LowlyPion

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    Friction is a resistance to force. If the rod is otherwise stabilized by balanced forces x,y , then the effect of friction is not a static consideration.
     
    Last edited by a moderator: May 4, 2017
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