---
title: "A small bob of mass \\(m\\) is attached to a light string of length \\(L\\). The bob swings in a vertical circle. At the lowest point of its path, the bob has a speed \\(v\\). Which of the following is a correct expression for the tension \\(T\\) in the string at this point?"
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url: "https://nerd-notes.com/ubq/110053/"
date_modified: "2026-05-01T22:20:00+00:00"
---

# A small bob of mass \(m\) is attached to a light string of length \(L\). The bob swings in a vertical circle. At the lowest point of its path, the bob has a speed \(v\). Which of the following is a correct expression for the tension \(T\) in the string at this point?

A small bob of mass \(m\) is attached to a light string of length \(L\). The bob swings in a vertical circle. At the lowest point of its path, the bob has a speed \(v\). Which of the following is a correct expression for the tension \(T\) in the string at this point?

![A bob is at the bottom of its circular swing. A string of length L is vertical, and connects the mass to a pivot point and is labeled L. Two arrows represent forces: an upward arrow labeled T that is visibly larger than the downward arrow labeled mg. A dashed line indicates the path of the arc.](https://nerd-notes.com/wp-content/uploads/ubq-diagrams/ubq-frq-generatedstem-fig-1-1777674000-90vQhj.jpg)

- **A.** \(T = \dfrac{mv^2}{L} - mg\)
- **B.** \(T = mg\)
- **C.** \(T = \dfrac{mv^2}{L}\)
- **D.** \(T = mg + \dfrac{mv^2}{L}\)

*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/110053/*