From: richalivingston@gmail.com   
      
   On Tuesday, October 11, 2022 at 2:23:59 AM UTC-5, Luigi Fortunati wrote:   
   > Richard Livingston lunedì 10/10/2022 alle ore 05:21:46 ha scritto:   
   >> ...   
   >   
   > The red force that at your suggestion I added to the rigid wagon of my   
   animation   
   > https://www.geogebra.org/m/adsgahwf   
   > in your opinion, is there or is it not?   
   >>> Is the acceleration of the two vagons the same?   
   >>   
   >> No, not initially. The water wagon will initially accelerate faster as   
   >> the effective mass is less (because the water is not moving yet). But   
   >> when the water sloshes back, towards the rear, it will slow down. The   
   >> exact motion depends on the "impedance" of the tractor pulling the   
   >> wagons.   
   > 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.   
      
   Rich L.   
      
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