UnityStandardAssets.Vehicles.Car.CarController.AddDownForce C# (CSharp) Method

        private void AddDownForce()
        {
            m_WheelColliders[0].attachedRigidbody.AddForce(-transform.up*m_Downforce*
                                                         m_WheelColliders[0].attachedRigidbody.velocity.magnitude);
        }