From: manfred.geilhaupt@fh-niederrhein.de   
      
   Hi together   
      
   "So, how is the centrifugal acceleration of water justified EVEN in the   
   inertial reference where the centrifugal force is not there? "   
      
   Simple (first, from the beginning) Question might have no answer.   
      
   I thought about it too. (Who not!)   
   So I had a private answer at least by the aid of Einstein I hope.   
      
   1. In reality no (100%)  inertial frame of reference does exist.   
   But this does not answer the question. But helps to understand Mach?   
      
   2. If you are a part of Newtons rotating bucket, let us say a water   
   molecule!  You (molecule) do not know: Is there a new gravitational   
   force acting or are all molecules simply rotating (accelerating by   
   Newton himself).   
      
   3. If you are an observer outside the rotating bucket, standing still on   
   earth (which does not stand still).  You know there is not a new G-Force   
   acting on molecules, there is a centrifugal force only, which is not   
   affecting on you like a G-Force could or would but there is acceleration   
   on the molecules simple to see for you but not for   
   molecules. Unfortunately you can not tell them what happens. So they   
   have two unique explanations. One is wrong. They never can find out. Man   
   can. (Woman of course too)   
      
   Best wishes   
   M.   
      
   By the way. Newtons definition of force from the Momentum Equation adopted   
   F=dP/dt=f1+f2+f3+f4+f5   
   leads to 5 force contributions from pure math applied. (We do not find all in   
   textbooks!)   
      
   Now the "physics(nature)" must give them reality (by inventing,   
   Einsteins wording, f1 up to f5) which nature might follow or not tells   
   us the experiment.  f3 is Coriolis and f5 I don't know. f2 is   
   Mass*Acceleration. We do not have it in textbooks. But every student can   
   find f1 to f5 by simple product rule applied! If you like see "mano4848   
   Sommerfeld Fine Structure Constant" (private investigation on YouTube)   
   https://www.youtube.com/results?search_query=manfred+sommerfeld+FSK   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)