  Considering some modified Newtonian potentials and the Hubble law in writing
the total energy of a test mass located at the edge of a flat
Friedmann-Robertson-Walker universe, we obtain several modified Friedmann
equations. Interestingly enough, our study shows that the employed potentials,
while some of them have some successes in modelling the spiral galaxies
rotation curves, may also address an accelerated universe. This fact indicates
that dark energy and dark matter may have some common origins and aspects.
