1. A ball whose weight is 2 N is attached to the end of a cord of length 2 m, as
ID: 1770247 • Letter: 1
Question
1. A ball whose weight is 2 N is attached to the end of a cord of length 2 m, as shown above. The ball is whirled in a vertical circle- NOT at constant speed -counterclockwise. The tension in the cord at the top of the circle is 7 N, and at the bottom the tension is 15 N Three students discuss the net force on the ball at the top of the circle: Angelica: "The net force on the ball at the top position is 7 N since the net force is the same as the tension. "The net force on the ball at the top position is 9 N. Both the tension and the weight are acting downward so you have to add them." Bo: rles: "No, you are both wrong. You need to figure out the centripetal force (mv'/r) and include it in the net force. " Explain briefly the errors, if any, in each student's reasoning. Your response should include one to two sentences per student, no more.Explanation / Answer
Bob is correct.
For considering the net force, we need to consider both tension and weight.
centripetal force is due to the resultant of net force so we no need to include in net force.
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