From: poutnik4REMOVEnntp@CAPITALSgmail.com.INVALID   
      
   Luigi Fortunati  Wrote in message:   
   > A tube is diametrically fixed on the carousel.   
   >   
   > In the tube there is a little ball free to move, which is "fired" out   
   > like a bullet.   
   >   
   > In the rotating reference of the carousel (and until it is inside the   
   > tube) the "projectile" moves outwards with increasing speed, ie with   
   > acceleration?   
   >   
   > If the answer is yes, the force that accelerates the ball in the tube   
   > is the "centrifugal" force?   
   >   
   > And if even this answer is yes, is this force real or apparent?   
   >   
   Within rotating frames,   
   Nonzero acceleration is acting on objects without any external force.   
   To keep the 2nd Newton law formally valid for no inertial frames,   
   fictitious  force concept has been invented.   
      
   ( F + Ffict) = m . a   
      
   For rotating frames, there are 3 fictitious forces ( each has its   
    Wikipedia article ):   
      
   Centrifugal  force,   
   related to an object  distance of rotation axis,   
   Coriolis force,   
   related to an object velocity,   
   Euler force,   
   related to a frame rotation  acceleration.   
      
      
   --   
   Libor Striz aka Poutnik ( a pilgrim/wanderer/wayfarer)   
      
   "Humour is the only effective weapon against stupidity."   
   Miloš Forman   
      
      
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