  We examine the kinetics of a snowball that is gaining mass while is rolling
downhill. This dynamical system combines rotational effects with effects
involving the variation of mass. In order to understand the consequences of
both effects we compare its behavior with the one of some objects in which such
effects are absent. Environmental conditions are also included. We conclude
that the comparative velocity of the snowball is very sensitive to the hill
profile and the retardation factors. We emphasize that the increase of mass
(inertia), could surprisingly diminish the retardation effect due to the drag
force. Additionally, when an exponential trajectory is assumed, the maximum
velocity of the snowball can be reached at an intermediate step of the trip.
