If there is a load of say, mass =m Kg which is being raised on the end of a light inextensible rope by means of a winch. see attachment. the pulley of the winch has a radium x meters and is lets say that it is frictionless. the acceleration of the load is a ms^-2 can someone tell me how would i calculate the Torque / moment on the pulley ? i know that torque = Force * Displacement here is what i think shud be the correct equation : net force =N = T - mg N[x]= Torque But the equation in my notes says otherwise : let K = the torque applied by the winch (the torque driving the pulley) Torque on the pulley = K - (x)(T) which one is correct and why ?