From: fortunati.luigi@gmail.com   
      
   Il 15/01/2026 07:25, Luigi Fortunati ha scritto:   
   > How can the son increase his force on his father to +610N if the force   
   > he's exerting (+600N) is already equal to his maximum capacity?   
   >   
   > [[Mod. note --   
   > The son can't increase /F_son_arms_on_son_hands/.  But the son doesn't   
   > directly control /F_son_hands_on_F_father_hands/: the additional 10N by   
   > which /F_son_hands_on_F_father_hands/ exceeds /F_son_arms_on_son_hands/   
   > is essentially due to the inertia of the son's hands (which are accelerating   
   > to the left with an acceleration of /a_hands/).   
   >   
   > This is similar to how /F_father_arms_on_father_hands/ is 630N, but   
   > /F_father_hands_on_son_hands/ is only 610N -- the 20N difference is due   
   > to the inerta of the father's hands (which are also accelerating to the   
   > left with an acceleration of /a_hands/).   
   > -- jt]]   
      
   Is the additional force +10N included in F_son_hands_on_F_father_hands   
   of +610N a real or apparent force?   
      
   Luigi Fortunati   
      
   [[Mod. note -- It's a real force, measured in an inertial reference frame.   
   -- jt]]   
      
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