Alex  wrote:   
   > > In the formula F=ma force is related to acceleration.   
      
   > I always write this formula as a=F/m in order to stress the fact that if a   
   > force F acts on a body/particle of mass m, then the particle will get an   
   > acceleration a given by a=F/m. This is the Newton's second law.   
      
      
   I prefer to write:    dv/dt = F/m   
      
   > F is the CAUSE (of the acceleration) and a is the EFFECT. I put the effect   
   > on the left hand side, and the cause on the right hand side,   
      
   You might therefore like this paper:   
      
       "How to be causal: time, spacetime, and spectra",   
       Eur. J. Phys. 32, 1687?1700 (2011)   
       doi:10.1088/0143-0807/32/6/022   
      
   with a longer version at arxiv:1106.1792   
      
      
   Mind you, some physicsts find the proposal intensely annoying,   
   and they disagree with it quite strongly - despite its deliberately   
   limited scope (i.e. on the interpretation of temporal differential   
   equations). There are thus several extra appendices in the arxiv   
   version addressing various points raised.   
      
   #Paul   
      
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