From: fortunati.luigi@gmail.com   
      
   Tom Roberts alle ore 07:54:37 di domenica 17/07/2022 ha scritto:   
   > The difference is: a real force cannot be made to vanish by changing   
   > coordinates, while a fictitious "force" will vanish in inertial   
   > coordinates.   
      
   Exactly.   
      
   I totally agree with you, the fictitious force disappears in the inertial   
   reference.   
      
   But if it doesn't go away, obviously it's not fictitious!   
      
   So, look at my animation   
   https://www.geogebra.org/m/mrthyefq   
      
   We are in an inertial reference where the centrifugal force should not be   
   there.   
      
   Still, the rope gets longer!   
      
   Can you explain to me how it stretches if there is no centrifugal force?   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)