---
title: "The diagram above shows a marble rolling down an incline, the bottom part of which has been bent into a loop. The marble is released from point A at a height of \\(0.80 \\, \\text{m}\\) above the ground. Point B is the lowest point and point C the highest point of the loop. The diameter of the loop is \\(0.35 \\, \\text{m}\\). The mass of the marble is \\(0.050 \\, \\text{kg}\\). Friction forces and any gain in kinetic energy due to the rotating of the marble can be ignored. When answering the following questions, consider the marble when it is at point C."
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url: "https://nerd-notes.com/ubq/23321/"
date_modified: "2025-10-02T12:55:10+00:00"
---

# The diagram above shows a marble rolling down an incline, the bottom part of which has been bent into a loop. The marble is released from point A at a height of \(0.80 \, \text{m}\) above the ground. Point B is the lowest point and point C the highest point of the loop. The diameter of the loop is \(0.35 \, \text{m}\). The mass of the marble is \(0.050 \, \text{kg}\). Friction forces and any gain in kinetic energy due to the rotating of the marble can be ignored. When answering the following questions, consider the marble when it is at point C.

The diagram above shows a marble rolling down an incline, the bottom part of which has been bent into a loop. The marble is released from point A at a height of \(0.80 \, \text{m}\) above the ground. Point B is the lowest point and point C the highest point of the loop. The diameter of the loop is \(0.35 \, \text{m}\). The mass of the marble is \(0.050 \, \text{kg}\). Friction forces and any gain in kinetic energy due to the rotating of the marble can be ignored. When answering the following questions, consider the marble when it is at **point C**.

![Diagram](https://nerd-notes.com/wp-content/uploads/2024/01/marble-sliding-down-a-ramp.png)

**Part a)** Draw arrow on the diagram or explain the direction of the resultant force acting on the marble. *(3 points)*

**Part b)** State the names of all the forces acting on the marble. *(3 points)*

**Part c)** Deduce that the speed of the marble is \(3.0 \, \text{m/s}\). *(3 points)*

**Part d)** What would happen to the the speed in part (c) if the release height of the marble were to double. Justify your answer. *(3 points)*


*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/23321/*