\input zb-basic \input zb-ioport \iteman{io-port 05992353} \itemau{Tenreiro Machado, J.A.} \itemti{Fractional dynamics of a system with particles subjected to impacts.} \itemso{Commun. Nonlinear Sci. Numer. Simul. 16, No. 12, 4596-4601 (2011).} \itemab Summary: This 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. \itemrv{~} \itemcc{} \itemut{fractional calculus; power law; entropy; non-linear dynamics; complex systems} \itemli{doi:10.1016/j.cnsns.2011.01.019} \end