  In this paper, we concern the generation of attractive net motion with
respect to the location of external wave source for active spherical carriers.
Here we recall that the exerted acoustic radiation force in an acoustic field,
resulting from an incident wave, a scattered wave, and the radiated wave from
the active carrier, can be positive, negative or zero based on the location of
the object in the field. Thus in a general case, a sustainable pulling motion
is not guaranteed. In this work, by considering the point that the average of
the radiation force for an object, active in a single mode, over a complete
wavelength is equal to the radiation force applied to a passive object (which
is always positive), we put forward a technique to generate the acoustic
radiation force with negative average over a complete wavelength to ensure that
the net motion is attractive. The idea here is a simultaneous excitation of the
object in two modes of breathing and first, with a difference in the phase of
excitations. We will also show that by controlling the phase difference, the
average of the force exerted on the object can be positive, negative or zero.
Moreover, we show that for specific phase differences not only the average of
the force is negative but also the force itself never experiences a positive
value in a whole wavelength at those phase differences, which this can be a
desired state to achieve a perfect negative net motion.
