public static Node createPhysicsTestNode(AssetManager manager, CollisionShape shape, float mass) {
        Node node = new Node("PhysicsNode");
        RigidBodyControl control = new RigidBodyControl(shape, mass);
        node.addControl(control);
        return node;
    }
creates an empty node with a RigidBodyControl

@param manager for loading assets
@param shape a shape for the collision object
@param mass a mass for rigid body
@return a new Node
jme3-examples/src/main/java/jme3test/bullet/PhysicsTestHelper.java