From: fortunati.luigi@gmail.com   
      
   Poutnik giovedì 21/09/2017 alle ore 08:58:38 ha scritto:   
   >> Newton claims that gravity is a force, Einstein denies it: for him it   
   >> is not a force (it is something else).   
   >>   
   >> It is obvious that both can not be right: if gravity is a force, Newton   
   >> is right and Einstein is wrong, and if it is the reverse Newton is   
   >> wrong and Einstein is right.   
   >>   
   >> It can not be otherwise!   
   >>   
   > It can be otherwise.   
   >   
   > IF Einstein used space and time the same way as Newton,   
   > Newton would be right and Einstein wrong.   
   >   
   > IF Newton used space and time the same way as Einstein,   
   > Newton would be wrong and Einstein right.   
   >   
   > But as both used space and time differently,   
   > both are right within definitions and assumptions of their theories.   
      
   "Strength" does not depend on space or even time.   
      
   --   
   Credere e' piu' facile che pensare   
   Believing is easier than thinking   
   Luigi Fortunati   
      
   [[Mod. note -- What's the operational definition of a force?  We often   
   use Newton's 2nd law, measuring a force by the acceleration it imparts   
   on a test mass.  That in turn requires an operational definition of   
   acceleration... which clearly does depend on our measurements of space   
   and time intervals.   
   -- jt]]   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)