A rock attached to a string swings in a vertical circle.Which free body diagram could correctly describe the force(s)on the rock when it is at the lowest point?

Question

Quizplus · Accepted Answer

At the lowest point, the tension in the string is providing the centripetal force to keep the rock moving in a circle. The gravitational force is acting downwards, and there is no force acting horizontally at this point. Therefore, option B correctly depicts the tension and gravitational forces acting on the rock.

A Rock Attached to a String Swings in a Vertical