Machado, J. A. Tenreiro2014-03-062014-03-0620111007-5704http://hdl.handle.net/10400.22/4140This paper studies the dynamics of a system composed of a collection of particles that exhibit collisions between them. Several entropy measures and different 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 systemsjournal article10.1016/j.cnsns.2011.01.019