Problem with .addForce( Vector3f force, Vector3f at )

Ok then, I've decided to ask for help.

Hello to everybody.

After some hours of searching and trying I'm still looking to a solution for a particular problem. I don't know if I'm facing a bug or if I'm misunderstanding what .addForce( Vector3f force, Vector3f at ) does.

let's say i have a DynamicPhysicsNode in the form of a cube, I decide a direction as a front, and I apply two opposite forces at the sides to the center of mass. The cube starts rotating, with costant acceleration, until 90