There is no Behavior for this, but you could do it by directly accessing the underlying Farseer physics objects. There is some info on the "Home" wiki page about this under Coding Techniques but it would basically go like this:
First get a reference to the main PhysicsController -
PhysicsControllerMain _physicsController = LayoutRoot.GetValue(PhysicsControllerMain.PhysicsControllerProperty) as PhysicsControllerMain;
You can then get at the GeometryObject and BodyObject for each of your objects (if you're unsure of the name of the objects, just place a watch on the PhysicsObjects dictionary and see what you have in there).
The code below is just a guess, I might be wrong on the method names but I think you would want to do ClearTorque and ClearForce...
The Farseer Engine has lots of properties that are not exposed in the Behaviors or Physics Helper controls. You can learn more about them at