From: arl_123234@hotmail.com   
      
   On 09/21/2017 02:30 AM, Luigi Fortunati wrote:   
   > Newton claims that gravity is a force, Einstein denies it: for him it   
   > is not a force (it is something else).   
   >   
   > It is obvious that both can not be right: if gravity is a force, Newton   
   > is right and Einstein is wrong, and if it is the reverse Newton is   
   > wrong and Einstein is right.   
   >   
   > It can not be otherwise!   
   >   
      
   Hello, and at the risk of over simplification, if it behaves like a   
   force in the Newtonian sense, then it is a force.  From a cause and   
   effect (e.g., the ability to do work on a mass) standpoint the genesis   
   of the force is irrelevant.  It's akin to the vector (cross) product in   
   3D being a "pseudo" (axial) vector (and not a tensor) as opposed to   
   being a "real" (axial) vector.  The vector product has both magnitude   
   and direction, so it fits that definition of a vector and works quite   
   well in applied math/engineering.  The analogy here is pseudo vector =   
   fictitious force and axial vector = "real" force.  Sincerely,   
      
   --   
   J. B. Wood	            e-mail: arl_123234@hotmail.com   
      
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