//  Newtonian quantities interactions 
//  ---------------------------------

#include "global.hpp"
#include "Force.hpp"
#include "Acceleration.hpp"
#include "Mass.hpp"

 Force  Mass::operator* (ACCELERATION rs) const    //  f = ma
   {return Force(value * rs.x(), 
                 value * rs.y(),
                 value * rs.z());
   }    

 Force  Acceleration::operator* (MASS rs) const     // f = am
   {return rs * (*this);}

 Mass Force::operator/ (ACCELERATION rs)  const     // m = f/a
   {return magnitude() / rs.magnitude();} 

 Acceleration Force::operator/ (MASS rs)  const     // a = f/m 
   {return Acceleration(x()/rs.grams(), 
                        y()/rs.grams(), 
                        z()/rs.grams());
   }