Amount of force applied to push the object toward the defined direction.
// Create a JointDrive, configure it and assign the JointDrive to
// the zDrive element of a configurable joint.
function Start() {
var joint : ConfigurableJoint = gameObject.AddComponent(ConfigurableJoint);
joint.targetPosition = Vector3(0,0,-10);
var drive : JointDrive = JointDrive();
drive.mode = JointDriveMode.Velocity;
drive.maximumForce = Mathf.Infinity;;
joint.zDrive = drive;
}