From: mikko.levanto@iki.fi   
      
   On 2024-01-28 22:58:55 +0000, Luigi Fortunati said:   
      
   > Luigi Fortunati il 23/01/2024 12:38:54 ha scritto:   
   >> [[Mod. note -- I would say that that's somewhat confusing terminology.   
   >> Forces are never "created" or "destroyed"...   
   >   
   > That's exactly what I say too.   
   >   
   > It is Einstein who talks about forces that "disappear": see the case of   
   > the painter when he falls from the scaffolding (and no longer perceives   
   > any force) and the case of the elevator when the cables break (and   
   > whoever is inside floats while he falls) .   
      
   If you want to see a force appear, the initial position of the ball   
   must be above the plane, not touching it.   
      
   If you want to see a force disappear you can use a spherical surface   
   istead of a plane.   
      
   Mikko   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)