  If we have a particle immersed in a field of random forces, each interaction
of the particle with the field can enlarge or diminish its kinetic energy. In
this work is shown that in general, for any field of random force with uniform
distribution of directions, the probability to gain kinetic energy is larger
that the probability to lose it. Therefore, if the particle is submitted to a
great number of interactions with the force stochastic field, the final result
will be that the particle will gain energy. The probability to gain energy in
each interaction is Pg=1/2 (1+T/(2Po)), where T is the impulse given by the
field and Po is the momentum of the particle before the interaction. The
probability to lose energy in each interaction is Pl=1/2 (1-T/(2Po)).
