In examining how rotations affect energy dissipation in the interaction between a grain and its environment, we focus on the relaxation process of a single particle bouncing on a flat horizontal surface. Faceted particles were employed to promote rotational motion during each bounce. The evolution of potential, translational, and rotational kinetic energies was examined, with particular emphasis on the moments immediately before and after collisions. The coefficient of restitution, e, quantifies the energy dissipation during the rebound and is defined as the ratio of the normal velocity component before impact (Vn) to the corresponding component after the collision (Vn') and therefore, it is linked to the translational kinetic energy in the normal direction. We find that for impact velocities below a critical threshold, some collisions result in e > 1, which can be attributed to the conversion of rotational kinetic energy into translational kinetic energy. This transfer increases Vn' and leads to higher values of e.