Angular momentum

From: "Fallingeagle" <falling_eagle1@xxxxxxxxxxx>
Date: 3 Nov 2006 10:08:14 -0800

Can someone explain Why the total angular momentum of a system with a
pully, and two masses joined by a massless string overt the pully
equals the angular momentum of the pully + the angular momentum of the
two masses?

why: L(sys) = L(pully) + L(masses)

I omega + m1 * v * r + m2 * v * r

This is what I do not understand:

the spin (AM) of the pully is caused by the the two masses, why is the
total spin not just the spin of the pully?

also: what is spin (angular momentum)....really??

.

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