1. I'm doing an experiment where I have a brass hollow cylinder, and I roll it down an inclined plane, and after each trial, I add fish weights to the inside of it to increase the mass. I'm testing the proportionality between mass and angular velocity, with my hypothesis being an inverse proportionality. What I was wondering was that in my calculations, would I need to calculate just Er=1/2(Iω2)? Or also normal kinetic energy? 3. The attempt at a solution What I plan to do is first roll the naked ring down, measure the distance, time, radius and mass of said ring, then repeat with 3 added fish weights to the inside of the ring. I would do this a total of 5 times. Then I would calculate the angular velocity of each trial, and make a graph of the relationship with mass. My hypothesis would be that it would be a curve. Then, I would take the inverse of the angular velocity, and the graph would then become a straight line. Bear in mind, this is for a senior level course in highschool, end-of-year cumulative assignment. Although the aforementioned is my main query, if there's any other mistakes or things that I have not taken into account, I would greatly appreciate being aware of them. Thank you for your time.