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Do friction forces exist?

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1. Homework Statement
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. Homework 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?
 
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LowlyPion

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1. Homework Statement
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. Homework 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?
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:

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