a ball of mass m is attached to a light string of length l. the ball is held with the string horizontal as shown in the diagram below. then, the ball is released. what is the tension in the string when the ball is at its lowest point?



Answer :

Therefore, the tension in the string at its lowest point is equal to the weight added to the required centripetal force.

The rope tension is always directed towards the center of the circle. Below it means tension is UP and gravity is DOWN. At the top, downward gravity provides the necessary centripetal force. Therefore the voltage is 0. At the bottom, tension must provide the necessary centripetal force and balance gravity equal to mg downwards. Zero voltage is loose. Strings and ropes are often idealized as dimensions with length but no mass and zero cross-section.

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