But as the rotational mass for example decreases, the angular velocity has to increase to compensate. Most people
don't set their own car's spinning deliberately. That is, they don't obtain angular momentum out of the ground by
driving funny. Most of the time they wait for collisions to occur and it's those collisions that transfer angular
momentum and start the cars spinning, at least when the cars are spinning wildly. So, we need to look at those
transfers of angular momentum. And that’s the job for the next video.