XPost: sci.math   
   From: ivvu@tor.ru   
      
   Jonathan Thornburg [remove -color to reply]" wrote:   
      
   >   F_net_on_m1 = F1 + F3 = 100-95 = +5 F_net_on_m2 = -F3 - F4 = -(-95) -   
   >   (55) = 95-55 = +40 F_net_on_m3 = F2 + F4 = -50 +55 = +5   
   > The forces are now different from the equal-mass case (which is not   
   > surprising, since we've changed the mass of each individual body).   
   > Notice that the forces are in the ratio   
   >   F_net_on_m1 = F_net_on_m3 = (1/8) F_net_on_m2   
   > which just match the ratios of the masses,   
   >   m1 = m3 = (1/8) m2   
   > This is just what we would expect from Newton's 2nd law, since all all   
   > three masses have the same common acceleration.   
   >   
   > So, the simple answer to Luigi's questions is "it depends on the body's   
   > internal mass distribution".   
      
   then you didn't yet got into the internal and external curvatures,   
   especially regarding large masses   
      
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