From: poutnik@privacy.net   
      
   Dne 13/04/2018 v 02:11 Augustin Coppey napsal(a):   
   > I believe the 3rd principle only works for static, solid and   
   > non-elastic objects.  One could argue your examples with liquids   
   > or moving objects, and find that 3rd principle fails, which is not   
   > correct.   
      
   It is valid for all objects with considered direct interaction,   
   including liquids, gas and elastic objects.   
      
   It it had not been, ....   
      
      F1 <> - F2   
      dp1/dt <> -dp2/dt   
      
   ..... the momentum conservation law had not been valid.   
      
      dp1 + dp2 <> 0   
      
   It is not valid in the classical sense   
   for distant objects interacting remotely,   
   but can be reformulated as valid   
   if there are considered field bosons like photons   
   as men-in-the-middle, transferring the momentum.   
      
   I am not sure how this is formulated in GR.   
      
   --   
   Poutnik ( The Pilgrim, Der Wanderer )   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)