Ok, right now in my college physics class, we're going over work in a circular motion. I see how gravity does the amount of work that the thing falls in a circular motion. However, my teacher told us that the tension of the string does no work. Gravity makes the ball go down, so gravity does taht work. What causes the work that makes the ball go to the side. the only work I can see in this example is gravity working down, but if that were true, then we wouldn't have the ball going left and right. Could anyone help me and tell me how the ball on the string can go left and right if the only work on it is gravity?