1. The problem statement, all variables and given/known data For my IB higher level physics extended essay I will have to calculate the angular momentum of a cylinder rolling down a slope. The cylinder is made out of copper and will be filled with a known mass of car engine oil. I think i can obtain the angular velocity fairly easily since it is just ω=2πF. My problem is with the moment of inertia of this cylinder. 2. Relevant equations I know that the equation for moment of inertia is 1/2mr2 but this does not take into account that there is a viscous liquid inside of the cylinder. For angular momentum I will use L=I*ω. 3. The attempt at a solution I have not tried much because the IB does not include moment of inertia in its syllabus so I am quite lost at the moment.