consider a pendulum. The mass 'm' is hung and now we are interested in finding the velocity so that it completes one circle. Clearly we can do it easily by conserving energy. Now my problem is with the top most point. Clearly the tension is minimum at this point so that string becomes slack. The forces acting on the mass is mg downwards, Tension downwards and since its in circular motion so the centripetal force acts towards the center. "How then does the particle not fall", is what my confusion is. since all the forces are downwards. However, i know this is completely untrue. The centripetal force equals mg + T acting on the mass but what about the "direction" it should act in outward direction but as i have read and know that centripetal force acts towards the center. Clear it please. Thanks in advance!!!!!