I posted another view of the an animation that is in plan view so that it is easier to see how the spheres are moving

competing radial fields

Newton Field with radial influence

This is adding radial fields to influence the orbit of the spheres as they move about the "food source" (newton field).

This is using a Newton field to show a very rought way of ants being affected by a food source.

Flocking

Controlling each object and how they move

Controlling the groups, but not the individual particals.