a ball with a weight of 2 N is attached to the end of a cord of length 2 meters.

Question

a ball with a weight of 2 N is attached to the end of a cord of length 2 meters. the ball is whirled in a vertical cirle clockwise as shown below. the tension in the cord at the top of the circle is 7 N and at the bottom it is 15 N. a) Three students discuss the net force on the ball at the top, Who is correct? Angela: 7 N since the net force is the same as tension Bo: 9N. both the tension and the weight are acting downward so you have to add them. Charles: you need to figure out the centripetal force (mv^2/r) and include it in the net force. b)Now the three students discuss the net force on the ball at the bottom, Who is correct? Angela: 15 N since the net force is the same as tension Bo: 17 N since you need to ass the weight of 2N to the tension of 15N Charles: 13N, you need to add the weight and tension but they are in different direction so they will subtract.

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