Would anyone kindly discuss the motion of a heavy chain ? A typical problem I am stuck with is as follows: A uniform chain of length 2a is hung over a smooth peg, with the lengths (a+b) and (a-b) of two sides. Motion is allowed to ensue - show that the time the chain would take to leave the peg is ..... Kindly discuss the motion and hint at the problem too. Isn't it a kind of varying mass problem? How should I treat the problem - the motion of the end points, that of the CGs of each side?