Lecture 17 Inelastic collision Elastic collision Superelastic collision Totally inelastic collision is when the objects stick together Momentum Principle for a system of particles 1 Choose system 2 Identify initial and nal states 3 Identify any external forces in order to determine whether any component of the momentum of the system is constant or not 4 For a xed choice of system if there are no external forces acting on the system then the momentum of the system is constant Collisions any interaction between usually two objects which occurs for short time intervals when interaction forces dominate over external forces K K and this is negative because K is negative Worked Example Gravitational Slingshot Initial relative velocity Final relative velocity Relative velocity
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