I'm working on a lab where I have to go into some detail about moment of inertia. I understand the concept and everything but am a little confused by the equation that I found on wikipedia. I've seen only two equations for this: momentum=torque divided by angular acceleration and one specifically for a disk: I=.5MR2 On wikipedia I they have the equation: T=ml2[itex]\omega[/itex]2 Wikipedia makes sense to me because I understand that as radius decreases momentum decreases at constant angular velocity. Neutron stars for instance maintain similar inertia at reduced radius but much higher angular velocity. Are all 3 ways true?