..., the required input data are the normal coefficient of restitution, the tangential coefficient of restitution and the coefficient of rolling friction. In order to accommodate shape and rotational effects in lumped mass models, two empirical factors related to size and normal impact velocity are employed. Using...

... simulations is the uncertainty and large variability of physical parameters such as coefficients of friction and normal coefficient of restitution. Rocks come in various shapes and sizes. Rock slope surfaces are rugged and materially inhomogeneous. In such situations deterministic analyses are rather futile...