Algodoo

The scene is in no-gravity mode.

The square into the empty circle is supposed to be attracted by the little square fixed on the circle.
Both objects are only A colliding.

The problem is that, if you just play the scene, the square will be attracted by the center hinge (which controls the empty circle), or even by the gravity center of the empty circle, if you delete the hinge.

I made some tests and discovered that the (very weak) gravitation force of the square into the circle was in cause.
So if you turn its gravitation off, the problem will disappear, but I need it for some reasons, and anyway, why should the square be attracted by a non-existing object?