Body:getAngularDamping
Gets the Angular damping of the Body
The angular damping is the rate of decrease of the angular velocity over time: A spinning body with no damping and no external forces will continue spinning indefinitely. A spinning body with damping will gradually stop spinning.
Damping is not the same as friction - they can be modelled together. However, only damping is provided by Box2D (and LOVE).
Damping parameters should be between 0 and infinity, with 0 meaning no damping,