From: someoneElse@Microsoft.com   
      
   Hello world,   
      
   I have a question on what causes the friction of a fluid like water or air   
   upon a surface while it is moving?   
      
   I understand basic some things like fluid/air pressure upon the object, the   
   fluid's viscosity and fluid 'layers' [By that I mean the slowing physical   
   'state' of movement of each layer of particles the closer you get to the   
   object.] I think the best example is a black hole...the closer you get to it   
   the slower time goes til it basically stops.   
   If I understand it correctly, if my interpretation is right... is it kind of   
   related to the theory of relativety? ( correct me if I am wrong in any   
   place).  :-)   
      
   So i guess perhapse knowing that stuff...is friction cause by the attraction   
   of the fluid to the solid at an atomic level, or is it air pressure, or   
   attraction of molecules of the fluid type to the solid type or the transfer   
   of kinetic energy from one place to another...?   
      
   Regards   
      
   Robert   
      
   I know this is a space forum but there aren't many science forums...   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)