1. The problem statement, all variables and given/known data When solving problems involving centripetal motion, say rotating a string/spring with an object attached to it, without taking into account of the mass of the string/spring. What effect would it have if we DID take it into account? 2. Relevant equations 3. The attempt at a solution If we were to twirl the mass in a horizontal circle, I would think that the weight of the string/spring would lower the height of the circular path, like a conical pendulum - affecting the radius of its path. Am I going in the right direction .. ?