From: fortunati.luigi@gmail.com   
      
   Sylvia Else ha scritto:   
   > The instantaneous net force at the point of contact has to be negligible   
   since the mass of a point is also negligible.   
   >   
   > You cannot expect to explain the behaviour of the system by looking just at   
   a single point.   
      
   Even when two heavy billiard balls collide, the contact occurs at a   
   single point, but this does not mean that the force exchanged there must   
   necessarily be negligible!   
      
   --   
   - Luigi Fortunati   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)