Tenreiro Machado, J. A.2019-04-172019-04-172010http://hdl.handle.net/10400.22/13626This paper studies the dynamics of a system composed of a collection of particles that exhibit collisions between them. Several entropy measures and di erent impact conditions of the particles are tested. The results reveal a power law evolution both of the system energy and the entropy measures, typical in systems having fractional dynamics.engFractional calculusPower lawEntropyNon-Linear DynamicsComplex systemsconference object10.1016/j.cnsns.2011.01.019