1. The problem statement, all variables and given/known data I will preface this with: I am in a mechanics class and the professor has made it his duty to explain every single concept in the most high level ways possible, often ignoring necessary basics. As a result, I suck at angular momentum (and plenty of other things) My best attempt at a drawing from my textbook: http://imgur.com/qUvQE A is the origin here. What is are the translational, rotational, and total angular momenta of this system? After a short time Δt, what is the linear momentum of the system, what is the rotational angular momentum of the system? 2. Relevant equations L= r x p mag(L)=mag(r(perp))*mag(P) Lrot=Iω 3. The attempt at a solution One problem I have is I'm unsure how to differentiate between translational and rotational L. I'm mainly confused as to when the general "r cross p" statement applies. I chalk this up to my professor being a string theorist that cannot teach all that well. I've tried setting up a center of mass, and attempted to solve for L using a perpendicular r of h+1/2d, and a momentum using the center of mass velocity. So, L comes out to -((h+1/2d)*(mvcom))...I would assume this is a total angular momentum? As you can see I'm a little lost, and I would appreciate any help greatly!