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I'm currently studying for a physics exam in regards to Newtonian mechanics. This chapter is about angular momentum, moments of inertia, etc.

As I was studying, something dawned on me, and I wondered if someone here might be able to help me.

The following relations are apparent to me:

velocity = radius * angular velocity

acceleration = radius * angular acceleration

But,

angular momentum = radius * momentum

Why is this? I, for some reason, assumed it would keep with the pattern for position, velocity, and acceleration and their respective angular relations.

I'm thinking it has to do with the fact that, when dealing with vectors, you have to take radius cross momentum. I know that the angular momentum vector points perpendicular from the direction of momentum (right hand rule), but I can't come up with a definitive answer.

Can anybody shed any light?