From: fortunati.luigi@gmail.com   
      
   Tom Roberts il 31/01/2024 08:59:59 ha scritto:   
   >> Gravity also exerts a force on the elevator.   
   >   
   > Not in GR, which is now the generally-accepted theory of gravitation.   
      
   The fact that it is "generally" accepted does not make it an absolute   
   truth (absolute truths do not exist).   
      
   > But to forestall your (baseless) objection, the standard definition of   
   > freefall says no NON-GRAVITATIONAL forces are acting on the object.   
      
   This standard definition is as legitimate as the one that says: a   
   metallic body that "falls" towards an electromagnetic pole accelerates   
   in the same way as the body that "falls" towards a similar center of   
   gravity.   
      
   The two accelerations are indistinguishable from each other (one   
   acceleration is as good as the other).   
      
   Are you able to demonstrate that it is possible to distinguish one   
   acceleration from another?   
      
   Luigi Fortunati   
      
      
   [[Mod. note --   
   The problem with the "magnetic free-fall" definition is that the   
   acceleration differs from one metallic body to another.  For example,   
   a copper body will experience different magnetic forces -- and hence   
   a different acceleration -- than an iron body.   
      
   In contrast, with the standard definition of free-fall, free-fall is   
   *universal*, i.e., *all* (non-spinning test) bodies have the same   
   (zero) non-gravitational forces, and (experimentally) they all have   
   the same free-fall acceleration.   
   -- jt]]   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)