From: lemhenyil@yahoo.ca   
      
   [[Mod. note --   
   1. I apologise for the delay in processing this article, which arrived   
      in my moderation email on 2022-10-27, but was unfortunately   
      misclassified as spam by my email provider.   
   2. I have rewrapped overly-long lines.   
   -- jt]]   
      
   On Wednesday, July 13, 2022 at 5:50:42 AM UTC-4, Luigi Fortunati wrote:   
   > When Newton's bucket starts to rotate, the water slowly starts to   
   > rotate as well and accelerates outwards due to the centrifugal force.   
   >   
   > But the centrifugal force is ONLY in the rotating reference and not in   
   > the inertial one.   
   >   
   > So, how is the centrifugal acceleration of water justified EVEN in the   
   > inertial reference where the centrifugal force is not there?   
           Centrifugal forces  in rotational reference frames are not   
   active forces  but reactive forces.  The active force on any given   
   point of a spinning object is the centripetal force imposed on it   
   by the mass-points on the same radius ..namely the ONES which are   
   closer to the rotational axis.  The reaction force ,to the centripetal   
   force exerted in-and-on this given point......is the so called   
   centrifugal force.  Objects.......exterior to the spinning body...will   
   appear rotating on circles around  the same centre ...that is they   
   appear to be .....one would say..under the effect of some centripetal   
   forces.  That said..... the mandatory force to exist in a rotational   
   frame is...the centripetal force ..and NOT the centrifugal force !   
   So...for parts of a spinning solid ,there is an action (centripetal   
   force)..and accordingly... there is a reaction (centrifugal force).   
   For matter which is outside of the spinning solid...there is ONLY...a   
   centripetal force, in the reference  frame of that given solid.   
   Best regards, LL   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)