From: relativity@paulba.no   
      
   Den 18.01.2026 18:17, skrev Ross Finlayson:   
   >   
   > I'm glad that you consider at least one degree of acceleration,   
   > with respect to velocity, eg dv/dt, yet, there are _infinitely-many_   
   > higher order derivatives of acceleration, _any one of which_ is   
   > nominally non-zero given any smoothly changing velocity.   
   >   
   >   
   > Then, you should get to wondering about the equivalence principle,   
   > and whether's gravity's perceived force of acceleration is really   
   > equivalent to reaction-mass acceleration, or about how it's not,   
   > since as lots of physics departments note the equivalency principle   
   > is violated a lot, just like momentum is lost in the wash in kinematics   
   > generally.   
      
   You are standing on the floor in a small room   
   without windows with an accelerometer fixed to the wall.   
   The accelerometer shows that it is accelerating   
   in the direction which to you is upwards.   
      
   If the accelerometer shows that the acceleration   
   is constant 1g, then there is no way you can   
   decide whether you are stationary at the ground,   
   or if you are accelerating at 1g in a spaceship.   
      
   If the accelerometer shows that the acceleration   
   is changing with time, then you know that you are   
   in a spaceship.   
      
   --   
   Paul   
      
   https://paulba.no/   
      
   --- SoupGate-Win32 v1.05   
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