L06_A
         Chapter 13.15 Problems Involving Energy and Momentum

L06_B
         Chapter 14.1 Introduction
         Chapter 14.2 Application of Newton's Laws to the Motion
                              of a System of Particles, Effective Forces
         Chapter 14.3 Linear and Angular Momentum of a
                               System of Particles
         Chapter 14.4 Motion of the Mass Center of a System
                               of Particles
         Chapter 14.5 Angular Momentum of a System of
                               Particles about Its Mass Center