some doubts regarding rotational dynamics

dreamz25

a) suppose we tie a ball with a string and rotate it keeping its other end tied with one of our fingers then the only external force acting on it is the tension. Which force then cancells 'mg' acting vertically downward?

b) if a mass is rotating in a circular path then in which direction does the net external force acting on it acts?

dreamz25	some doubts regarding rotational dynamics Tweet a) suppose we tie a ball with a string and rotate it keeping its other end tied with one of our fingers then the only external force acting on it is the tension. Which force then cancells 'mg' acting vertically downward? b) if a mass is rotating in a circular path then in which direction does the net external force acting on it acts?