From: fortunati.luigi@gmail.com   
      
   Richard Livingston martedì 11/10/2022 alle ore 16:04:20 ha scritto:   
   >> The water cannot move back and forth because the tank car is totally full   
   and there are no empty spaces.   
   >   
   >  In that case the two cars will behave exactly the same.   
      
   And this means that in the rigid vagon there is a horizontal inertial   
   force during acceleration, as can be seen in my last animation   
   > https://www.geogebra.org/m/eega7se6   
      
   The strange thing is that inertial forces should only "appear" in   
   accelerated reference frame and not in my animation set in inertial   
   reference frame.   
      
   Luigi   
      
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