From: relativity@paulba.no   
      
   Den 26.01.2026 16:11, skrev Maciej Woźniak:   
   > On 1/26/2026 1:40 PM, Paul B. Andersen wrote:   
   >> Den 25.01.2026 22:15, skrev Maciej Woźniak:   
      
   >>> On 1/25/2026 7:59 PM, Paul B. Andersen wrote:   
   >>>> The net vertical component of the force acting on   
   >>>> the object is:  Fᵥ = 9.8 N  (constant upwards)   
      
   >>> If it was, poor trash - the object would   
   >>> accelerate upward.   
      
   >> You _know_ that the string is pulling the object   
   >> with mass 1 kg with a force F = 9.8 N upwards.   
   >> If it were not, the object would be in free fall.   
      
   > Right, poor trash - if not it would be in free   
   > fall.   
      
   >> So why do you claim that this upwards force doesn't exist?   
      
   > Why do you lie, again? Well, that's   
   > because you're a piece of relativistic   
   > shit and lying is what your moronic religion   
   > is training its doggies for. Apart of that   
   > they are usually unable for anything,   
   > just like you.   
      
   I think we leave it at that. :-D   
      
   ------   
      
   > I mean you should learn that   
   > 1) acceleration is a velocity change (second   
   > derivative of location in time)   
      
   I now understand why you thought that   
   if the speed of an object is constant zero   
   in its own rest frame, then the acceleration   
   must be zero.   
   That is wrong, any object is stationary in its   
   rest frame, and any object can be accelerated.   
      
   The "proper acceleration" of an object is by definition   
   the acceleration measured in the object's rest frame.   
      
   An accelerometer measures "proper acceleration" along one axis.   
   It does it with no connection to anything which is outside   
   the enclosure around the accelerometer.   
   An accelerometer cannot think, and knows nothing about Newton   
   or Einstein, it just measures the proper acceleration.   
      
   If you sit in a car and measure the horizontal acceleration   
   of the car with an accelerometer, and the accelerometer   
   shows - say 2.13 m/s² - then this is, within three-digit   
   precision, the same as dv/dt where v is the speed of the car   
   relative to the ground.   
   So horizontally the accelerometer shows the acceleration   
   to be what Newton says it should be (within said precision).   
      
   If we swing the accelerometer 90⁰ so it measures the vertical   
   acceleration, then the accelerometer shows that the proper   
   acceleration is - say 9.81 m/s² - upwards.   
   This is in accordance with what Einstein says it should be,   
   while Newton says it should be zero.   
      
   Why should the accelerometer work properly for horizontal   
   accelerations, and not work at all for vertical acceleration?   
      
   The vertical acceleration Newton say is zero is a coordinate   
   acceleration which an accelerometer cannot measure.   
   An accelerometer measures the real proper acceleration which   
   is independent of coordinates and frames of reference.   
      
   So your real proper acceleration is ~ 9.81 m/s² upwards.   
      
   --   
   Paul   
      
   https://paulba.no/   
      
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