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We calculate and verify with simulations the ratio between the averagetranslational and rotational energies of systems with rough, inelasticparticles, either forced or freely cooling. The ratio shows non-equipartitionof energy. In stationary flows, this ratio depends mainly on the particleroughness, but in nonstationary flows, such as freely cooling granular media,it also depends strongly on the normal dissipation. The approach presented hereunifies and simplifies different results obtained by more elaborate kinetictheories. We observe that the boundary induced energy flux plays an importantrole.Comment: 4 pages latex, 4 embedded eps figures, accepted by Phys Rev

Energy nonequipartition in systems of inelastic, rough spheres