Two dimensional relativistic collision
   
      Some Modern Physics and Special Relativity textbooks 
      use a two dimensional collision of point particles to
      find the dependence of mass with velocity; however their
      figures  are for non relativistic trajectories.
      
     
      This program shows this relativistic collision from two
      reference systems: the laboratory and a rocket. 
      The program allows the selection of particle B (top one 
       in each system) using the horizontal scroll bar. This
      velocity is taken the same as the one for the displacement
      of one system relative to the other.
      
      
         The program also allows the selection of the rate at which
       the collision takes place; if it is less than 1.0, the
      process transcurs slowly, and greater than 1.0, faster. In this
      way we simulate the "projection" of a movie in which the frames per
      second can be varied. 
      It is posible to analyze the collision from other points of
      view: in a  Minkowski diagram and in a non relativistic treatment.
      
      Disponible en espaņol
      
Minkowski diagram |
         Non relativistic treatment
         
       
       Instructions
        
         The velocity of particle B (top in each system) is 
         selected with the horizontal scroll bar.
         
         
         The rate at which the motion takes place is selected with
         the vertical scroll bar.
         
         Vel B is the velocity of particle B (top in each system)
            in the laboratory system. 
         v  is the displacement velocity  of one reference
            system with respect to the other. 
         rate  Related to the frames "projected" per unit time
                      in the rocket reference system.