I know how to compute it and how to use it in equations. I do not understand what is physically happening however. When you turn a disk to the right the angular momentum is the cross product of the forces so it goes perpendicular to them and away from you. To the left would be towards you. But the disk isnt moving in those directions, how can it have momentum in the direction if it is just sitting there spinning? All the particles are moving around the disk and none are moving or even wanting to move in any perpendicular direction unless you apply another torque on the object giving it another cross product, then all of a sudden the two cross product forces start chasing each other and they come alive. I don't get it!! I guess to sum it up, what exactly is a cross product of two forces, not how do you compute it, but what is happening physically to the mass that involves the perpendiuclar direction? Also, why does right produce away and left produce towrds, who chose those directions, it is not a skrew threaded to do that.... Isnt space symetrical?