From: fortunati.luigi@gmail.com   
      
   I'm in the car and, when cornering, the lighter on the dashboard, from   
   my point of view, accelerates in a centrifugal direction.   
      
   Since it is I who accelerate (together with the machine I am bound to)   
   and not the lighter, can we say that my acceleration is "real" and that   
   of the lighter is "apparent"?   
      
   --   
      
      
   Luigi Fortunati   
      
   [[Mod. note -- Yes, we can say that.  Newtonian mechanics has the   
   concept of an inertial reference frame (IRF); the Earth's surface is   
   a fairly good approximation to an IRF.  You (in the car when cornering)   
   are accelerating with respect to the Earth's surface (an approximate   
   IRF).   
   -- jt]]   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)