1. The problem statement, all variables and given/known data Hello I need to find a an equation that describes the rundown of a wheel as function of the time. The wheel is running at an constant speed and is then disconnected and runs down to standstill. We know what the angular velocity of the wheel is at time 0, Wm. We know the inertia, J. with this we can calculate the kinetic energy in the wheel at time 0 as E = J * Wm^2 / 2 Now we also now the Friction losses in kW at the constant speed, Pfr at time 0. What i want to know is how to combine these. I know that the frictional losses are subtracted somehow from the kinetic energy but i down now where to start. Any help appreciated.