From: dr.j.thornburg@gmail-pink.com   
      
   In article  Luigi Fortunati wrote:   
   > Suppose that body A has mass M=1000 and body B has mass m=1 [[...]]   
   >   
   > If another unit mass 1 is added to body B, its mass doubles to m=2 and   
   > the force acting between the two bodies also doubles, [[...]]   
   >   
   > But if the other unit mass is added to body A (instead of body B) the   
   > mass of A will become equal to M=1001 (remaining almost unchanged) just   
   > as the force between the two bodies remains practically unchanged [[...]]   
   >   
   > Why does the force acting between the two bodies double if we add the   
   > unit mass to body B and, substantially, does not change if we add it to   
   > the mass of body A?   
      
   In article , I replied   
   | Why not?  Why might we expect the effects of adding mass in one location   
   | (A) to be the same as those of adding mass in a different location (B)?   
      
   In article , Luigi replied   
   > Yes, we *should* expect the same effects if we mean the same thing by   
   > "effects."   
   >   
   > I'm talking about masses (causes) and forces (effects): what effects   
   > are you talking about?   
      
   Let's analyze a somewhat more general system:  Suppose we have a pair   
   of masses A and B, and consider the effects of adding a mass C at either   
   position #1 or position #2.   
   	[Luigi's original question had position #1 = position   
   	of A, position #2 = position of B, mass A = 1000, mass   
   	B = 1, and mass C = 1, but I find it useful to consider   
   	the more generic case.]   
      
   A+B+C1 and A+B+C2 are *physically different* systems (going from one to   
   the other involves moving the mass C from position #1 to position #2).   
   So why should we expect any of the following Newtonian gravitational   
   effects to be the same between these two *physically different* systems:   
   * Newtonian gravitational potential U at some test point X   
   * Newtonian gravitational acceleration "little-g" at some test point X   
     (= - gradient of U)   
   * force between A+C1 and B versus force between A and B+C2   
      
   In fact, it's easy to see that all three of these "effects" differ...  as   
   we should expect, because (again) we're comparing *physically different*   
   systems.   
      
   --   
   -- "Jonathan Thornburg [remove -color to reply]"    
      "[I'm] Sick of people calling everything in crypto a Ponzi scheme.   
       Some crypto projects are pump and dump schemes, while others are pyramid   
       schemes.  Others are just standard issue fraud.  Others are just middlemen   
       skimming off the top.  Stop glossing over the diversity in the industry."   
                                                    -- Pat Dennis, 2022-04-25   
      
   --- SoupGate-DOS v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)