  Effects of a 4d dilaton field on a falling test mass are examined from the
Einstein frame perspective of scalar-tensor theory. Results are obtained for
the centripetal acceleration of particles in circular orbits, and the radial
acceleration for particles with pure radial motion. These results are applied
to the specific case of nonrelativistic motion in the weak field approximation
of Brans-Dicke theory, employing the exact Xanthopoulos-Zannias solutions. For
a given parameter range, the results obtained from Brans-Dicke theory are
qualitatively dramatically different from those of general relativity. Comments
are made concerning a comparison with the general relativistic results in the
limit of an infinite Brans-Dicke parameter.
