1. The problem statement, all variables and given/known data You have a flywheel rotating at 1000rpm. It has a moment of inertia of 0.5 Kgm^2 and a diameter of 0.5m. It is unclear if you know the mass. You know the moment of inertia, which is calculated using mass, but whilst the flywheel is circular i'm not sure that the surface area is that of a circle (as it may have ridges or something cut into it) A tangential friction force is then applied to the rim of the flywheel (in the opposite direction of rotation to the flywheel), the force is 1000N. Find the time it takes in minutes for the flywheel to come to rest. 2. Relevant equations Not sure if any other equations are needed... I've tried a few attempts, but i don't want to list them incase they influence anyones thinking Many thanks, Kalus.