Imagine there is a bicycle wheel. At 1 point on the wheel a rope is fixed to the wheel. The rope is wrapped around the wheel 180 degrees and on the other end of the rope their is a weight (see image below). The point is actually that I want to compare the weight dropping from different heights (to make the wheel turn) and see which acceleration the wheel gets from these different heights. NB: The wheel will only accelerate 180 degrees. Please help => HOW??!