could you explain what exactly causes friction?

Subject: could you explain what exactly causes friction?

Date: Wed Nov 15 18:29:32 2000
Posted by teddy
Grade level: 10-12 School: No school entered.
City: mexico city State/Province: No state entered. Country: mexico
Area of science: Physics
ID: 974330972.Ph

Message:


when i say 'what causes', i'm thinking 'microscopically' 
ie. what exactly 
is going on between molecules of the two surfaces 
friction having its 
effect on.  I understand about the friction coefficient bein
g different for 
differents combinations of surfaces, but i'm interested in 
why exactly this 
is.  thanks.

Re: could you explain what exactly causes friction?

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