From: relativity@paulba.no   
      
   Den 25.01.2026 22:15, skrev Maciej Woźniak:   
   > On 1/25/2026 7:59 PM, Paul B. Andersen wrote:   
   >> Den 24.01.2026 13:08, skrev Maciej Woźniak:   
   >>> On 1/24/2026 12:34 PM, Paul B. Andersen wrote:   
   >>>> Den 24.01.2026 07:51, skrev Maciej Woźniak:   
   >>>>> On 1/23/2026 8:32 PM, Paul B. Andersen wrote:   
   >>>>>> Den 22.01.2026 22:31, skrev Maciej Woźniak:   
   >>>>>>> On 1/22/2026 9:57 PM, Paul B. Andersen wrote:   
   >>>>>>>>   
   >>>>>>>> Let us look at a concrete example.   
   >>>>>>>> The length of the string is L = 1.4142 m, and the mass m is 1 kg.   
   >>>>>>>> You swing the object such that it takes t = two seconds to make   
   >>>>>>>> a full turn.   
   >>>>>>>> You observe that the angle of the string to the ground is 45⁰.   
   >>>>>>>> That means that the radius of the circle the object is moving   
   >>>>>>>> along is:   
   >>>>>>>>   r = L/√(2) = 1 m   
   >>>>>>>> It is then easy to calculate that the speed of the object is   
   >>>>>>>>   v = 2⋅π⋅r/t = 3.14 m/s   
   >>>>>>>> The horizontal centripetal acceleration is:   
   >>>>>>>>   aₕ = v²/r = 9.8 m/s²  (towards centre of circle)   
   >>>>>>>> The horizontal component of the tension in the string is:   
   >>>>>>>>   Fₕ = m⋅aₕ = 9.8 N   
   >>>>>>>> Since the angle of the string to the ground is 45⁰, the vertical   
   >>>>>>>> component of of the tension in the string is:   
   >>>>>>>>   Fᵥ = Fₕ   
   >>>>>>   
   >>>>>> The vertical component of the force acting on the object is:   
   >>>>>>    Fᵥ = 9.8 N  (constant upwards)   
      
   >>>>> So what?   
      
   >>>> Do you have a reading comprehension problem?   
   >>>>   
   >>>> So according to Newton's law F = ma the acceleration   
   >>>> of the object is a = F/m = 9.8 m/s²  (upwards)   
      
   >>> Do you have a reading comprehension problem,   
   >>> poor trash?   
   >>> Of course you do, otherwise you would know   
   >>> that Newton's law is  for unbalanced (or,   
   >>> if you prefer, net) force.   
      
   >> 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. It doesn't, the vertical   
   > component of velocity is constant and 0.   
   > Sorry, poor trash.   
      
   Why do you pretend to be an idiot?   
      
   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.   
      
   So why do you claim that this upwards force doesn't exist?   
      
   You do understand that the force the chair is   
   acting on your butt is upwards, don't you?   
   Or don't you?   
      
   >> You can feel the net force acting on _you_   
   >> right now, and you can measure it precisely.   
   >> If you sit on a weight, you can measure the net   
   >> force the weight is acting on your butt.   
   >> It will be F = 9.8⋅m N  where m is your mass.   
   >> This upwards force is the net unbalanced force.   
   >> If the force were balanced it would be zero,   
   >> and the weight would show that you were weightless.   
   >>   
   >> The force pushing your butt will give you a proper   
   >> acceleration 9.8 m/s² upwards.   
   > Stop mumbling and learn some basic physics,   
      
   You mean I should learn that the law F = ma is invalid   
   if F is a vertical force?   
      
   > poor trash.   
      
   --   
   Paul   
      
   https://paulba.no/   
      
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