1. The problem statement, all variables and given/known data A spinning flywheel has rotational inertia I = 403.8 kg · m2. Its angular velocity decreases from 20.0 rad/s to zero in 256.8 s due to friction. What is the frictional torque acting? 3. The attempt at a solution I tried using Vt = r |w| and Wav = change in theta / change in time, to get r, but I'm not sure if that's right, Then I used I = 1/2mr^2 to get mass. Finally, I used F=ma to get Force, using the mass found above and acceleration = change in velocity (aka 20*57) / change in time. Then I had force and radius for plugging into torque = radius*force.