We present a microscopic derivation of the equation of motion for a vo
rtex in a superconductor. A coherent view on vortex dynamics is obtain
ed, in which both hydrodynamics and the vortex core contribute to the
forces acting on a vortex. The competition between these two provides
an interpretation of the observed sign change in the Hall angle in sup
erconductors with mean free path l of the order of the coherence lengt
h xi in terms of broken particle-hole symmetry, which is related to de
tails of the microscopic mechanism of superconductivity.