From: fortunati.luigi@gmail.com   
      
   Luigi Fortunati il 01/02/2024 01:44:37 ha scritto:   
   > [[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]]   
      
   Ok, let's call "free fall" only the gravitational one which is universal (the   
   same for everyone) and "non-free fall" the one with the addition of   
   electromagnetic acceleration.   
      
   On the scaffolding there are the painter and the metal robot (with the same   
   mass) and underneath there is an electromagnet with a force equal to the   
   gravitational one.   
      
   Obviously, the electromagnet only acts on the robot and not on the painter.   
      
   When they are on the scaffolding, the weight force of the robot is double   
   (despite having the same mass as the painter) because it is subject to two   
   forces: gravitational and electromagnetic.   
      
   When they fall, the robot's acceleration is double that of the painter because   
   it is generated by two forces instead of just one.   
      
   Therefore, let's call that of the painter "free fall" (without electromagnetic   
   acceleration) and that of the robot "non-free fall " (because there is the   
   addition of electromagnetic acceleration).   
      
   And now we see the effects of "free fall" and " non-free fall ".   
      
   In the "free fall" of the painter, Einstein says that the gravitational force   
   disappears (because it is not a real force) and I ask: does the gravitational   
   acceleration of the painter in free fall also disappear like the gravitational   
   force or does the    
   force disappear and not the acceleration ?   
      
   And during the robot's "non-free fall", which force (gravitational or   
   electromagnetic) disappears and which does not? And which acceleration   
   disappears and which does not?   
      
   Luigi Fortunati   
      
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