Hi, I'm interresting about the weight of the support of the pendulum with an initial speed. It is the http://en.wikipedia.org/wiki/Pendulum but with an initial speed. The mass come at top with straight initial speed and after turn around the pendulum. I attempt to have the weight of the support but I have more than the real weight. Example, if I put 10 N turn around with an initial speed of 10 m/s and a radius of 1 m I have 11.36N for the weight of the support. I don't find my error, if you can help me ? I have put my equations, and if you can find the problem I would be happy.