From: fortunati.luigi@gmail.com   
      
   Mikko il 06/02/2024 09:26:51 ha scritto:   
   >> There is a well that reaches exactly the center of the Earth and there   
   >> are two elevators: one stationary at the bottom of the well (elevator A)   
   >> and the other in free fall (elevator B).   
   >>   
   >> Are the two elevators inertial reference systems of the same type or is   
   >> one reference system more inertial than the other?   
      
   > The elevator B is moving so it is affected by air resistance and other   
   > friction effect. It also meets the fast varying tidal effects from   
   > density variations in the matter around the well.   
   >   
   > If these effects can be kept small enough that they cannot be detected   
   > in B then B is in free fall.   
   >   
   > If the well is deep enough that the elevator A does not touch its   
   > bottom the elevator A is in free fall.   
   >   
   > If both elevators are in free fall in the above sense then there is   
   > no detectable difference in the conditions inside of the elevator.   
   >   
   > When the two elevators collide neither of the elevators is no longer   
   > in free fall.   
      
   You're twisting everything I wrote.   
      
   I wrote that the well ends at the center of the Earth (the bottom of the   
   well is at the center of the Earth).   
      
   That elevator A is STOPPED at the bottom of the well and, therefore, is   
   stationary at the center of the Earth.   
      
   That elevator A stays still not because the bottom of the shaft prevents   
   it from falling but because (at the center of the Earth) there is no   
   force of gravity and no space-time curvature that sets it in motion to   
   go somewhere: it stays still because nothing and no one pushes him   
   somewhere.   
      
   That elevator B is in free fall without friction and without resistance.   
      
   That elevator B is falling (in free fall) towards elevator A which it   
   will collide with in the future.   
      
   I would like to know *now* (before their clash) if they are both   
   inertial reference systems and if they are in the same way or if one is   
   more inertial than the other.   
      
   I hope I have been clear.   
      
   Luigi Fortunati   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)