From: fortunati.luigi@gmail.com   
      
   In the animation of Newton's pendulum   
   https://www.geogebra.org/classic/pwvqwpme   
   there is the first sphere that hits point A of sphere 2, on which it   
   exerts its action F1.   
      
   Does this red force F1 stop at point A or does it continue undisturbed   
   through the bodies of spheres 2, 3 and 4, up to point B of sphere 5,   
   where it arrives with almost unchanged intensity, as seen in the   
   animation?   
      
   Luigi Fortunati   
      
      
   [[Mod. note -- Forces never "stop" at a point.  The actual mechanics   
   are a bit more complicated -- see   
     https://en.wikipedia.org/wiki/Newton%27s_cradle   
   for a nice discussion.   
   -- jt]]   
      
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