On the subject of "moon spinning," I seem to recall that there is one moon in the solar system with "retrograde rotation," but don't recall which planet might be its owner.

In the commonly assumed formation of a moon by ejection from its planet by some outside impact, the moon would be expected to have the same angular velocity of rotation as the surface from which it was spawned, and under most impact/ejection conditions a lateral velocity close to the tangential surface speed from which it came.

The tendency then would be for a moon always to orbit in the same direction as the planet's rotation, and also to rotate in the same direction as the planet, as it does for nearly all the moons known. The speed of rotation could be slowed by tidal forces, as has been explained above, but probably would ever increase once the "lock" condition in which one face always points to the planet, as for our moon, has been reached - except by an extraordiary event.

I recall that someone (I think it was Foolestroupe) once suggested the General Purpose Answer for such questions, but I'm a bit too lazy at the moment to pursue the subject to something more satisfactory. Does anyone recall a "reverse rotating" moon in the solar system - or elsewhere?

John