From: fortunati.luigi@gmail.com   
      
   Luigi Fortunati alle ore 12:00:40 di martedì 02/08/2022 ha scritto:   
   > [[Mod. note --   
   > ...   
   > To understand how they can both be correct, it's useful to ask how   
   > one could distinguish one condition from the other *observationally*.   
   >   
   > That is, how could you *measure* whether whether the spring is or isn't   
   > tilted?   
      
   It is the theory itself that tells me if the spring tilts or not.   
      
   If the theory tells me that the two extremities are released   
   simultaneously, I obviously deduce that (falling) it does not tilt.   
      
   If he tells me that one end is released before the other, I equally   
   obviously deduce that (falling) it tilts.   
      
   [[Mod. note -- What does the word "simultaneously" mean?  In special   
   relativity simultaneity is observer-dependent, i.e., different observers   
   will in general not agree on whether two (spatially-separated) events   
   are simultaneous.  There's no universal notion of "simultaneous".   
      
   In the same way, whether or not the spring tilts is observer-dependent;   
   there's no universal notion of tilt.   
      
   Your two "conditions" are each internally consistent and correct.   
   There's no contradiction between them; they're simply different ways   
   of describing the same events.   
   -- jt]]   
      
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