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Angular Momentum of a Point Mass
       
  The angular momentum, L of a point mass is given by  
   
  and the moment of inertia of a point mass, about a point a perpendicular distance, r away from the line along which it is moving is given by  
   

   
 
therefore                
 
     
    and since            
 
    we can write            
 
   
Which means that the angular momentum of a point mass is equal to its linear momentum multiplied by its perpendicular distance from the point considered.  
   
Notice that, although we tend to think of bodies moving in circular paths when we think of angular quantities, we can calculate the angular momentum of a body, about any point (for example, point O in the diagram here) even if the body is moving in a straight line.  
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