From: fortunati.luigi@gmail.com   
      
   Luigi Fortunati alle ore 11:57:05 di giovedì 14/07/2022 ha scritto:   
   > [[Mod. note   
   >> And what happens in this case? Is it the water accelerating   
   >> (centrifugally) outward or is the bucket walls accelerating   
   >> (centripetally) inward?   
   >   
   > For simplicity let's focus on what happens once the bucket has been   
   > spinning at a constant angular velocity for a long time, so that the water   
   > is in uniform rotation at that same angular velocity.  [I.e., let's ignore   
   > the transient "startup" phase where the water's rotation is not yet uniform,   
   > since the motion then is very complicated and hard to analyze.]   
   > -- jt]]   
      
   Why do you say that the motion of the transitional phase is very   
   complicated and hard to analyze? Where do you see all this difficulty?   
      
   In this phase, one can easily observe the water which, initially in   
   equilibrium, progressively begins to accelerate towards the outside,   
   where it ends up accumulating against the walls of the bucket.   
      
   If the water accelerates outward, it means that there is a force   
   directed outward.   
      
   If the walls of the bucket do not accelerate inwards, it means that   
   there are no forces accelerating the walls of the bucket inwards.   
      
   It is the water that is set in motion by pushing towards the outside,   
   not the walls of the bucket which (remaining still) simply block that   
   centrifugal thrust!   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)