  As a second paper in series with arXiv:2108.01539, we discuss here quantum
vacuum friction on an intrinsically dissipative particle. The friction arises
not only from the field fluctuations but also from the dipole fluctuations
intrinsic to the particle. As a result, the dissipative particle can be out of
the nonequilibrium steady state (NESS), where it loses or gains internal
energy. Only if the temperature of the particle equals a special NESS
temperature will the particle be in NESS. We first derive the NESS conditions
which give the NESS temperature of the particle as a function of the radiation
temperature and the velocity of the particle. Imposing the NESS conditions, we
then obtain an expression for the quantum vacuum friction in NESS. The NESS
quantum vacuum friction is shown to be always negative definite, therefore a
true drag. The NESS temperature and quantum vacuum friction are calculated
numerically for various models. Out of NESS, even though the quantum vacuum
frictional force no longer has a definite sign in the rest frame of the
radiation, we find the external force needed to keep the particle moving must
be in the same direction as the motion of the particle. This then excludes the
possibility of making a perpetual motion machine, which could convert the
vacuum energy into useful mechanical work. In addition, we find that the
deviation of the temperature of the particle from its NESS temperature causes
the particle to lose or gain internal energy in such a way that the particle
would return to NESS after deviating from it. This enables experimental
measurements of the NESS temperature of the particle to serve as a feasible
signature for these quantum vacuum frictional effects.
