From: ram@zedat.fu-berlin.de   
      
   "J.B. Wood"  writes:   
      
   >Why does the curvature of space-time give rise to a force/acceleration?   
      
     When you use the expression "curvature of spacetime",   
     it seems that you use the conceptual framework of the   
     general theory of relativity.   
      
     Within this framework, the curvature of spacetime does   
     /not/ give rise to a force. Gravity is /not/ a force therein.   
      
     When there are no electromagnetic forces, all particles   
     move on geodesics (even in the presence of energy-momentum).   
     A geodesic in curved spacetime is what corresponds best to a   
     straight line in non-curved spacetime.   
      
     See also: arxiv.org/pdf/gr-qc/0103044   
   `   
      
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