Hello, 1. The problem statement, all variables and given/known data I am asked to show that the time it would take a bead to slide down a smooth cord, positioned at an angle beta wrt the vertical axis, is independent on that angle (between the cord and the axis). The bead starts its slide from rest. 2. Relevant equations 3. The attempt at a solution I was initially not sure whether I should write down force equations or use energy conservation, so I have tried both (should I have used impulse, insead?). In any case, for the forces acting on the bead sliding down I got: mgsin(beta) = N ; mgcos(beta) - T = md2x/dt2 And from conservation of energy I got: mgy = 1/2*mv2 My problem is that I am really not sure any of these equations are flawless as they stand, AND they all seem to be dependent on the angle beta. Could someone please advise?