1. The problem statement, all variables and given/known data When someone ties a string to a ball and swings it in a circular motion is the string doing work on the ball? 2. Relevant equations 3. The attempt at a solution Ok I am a little bit lost here it does seem that the tension on the string is doing work on the ball but again there is no change in kinetic energy(constant rotation) so could there be no work at all? I am totally lost here .