---
title: "A sled of mass M is released from rest at the top of a rough incline of height H and length L. The sled slides down the incline, experiencing a constant kinetic friction force of magnitude f, and reaches the bottom with speed v. Which of the following correctly describes the energy of a specified system as the sled slides from the top to the bottom of the incline?"
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url: "https://nerd-notes.com/ubq/109194/"
date_modified: "2026-03-21T10:38:04+00:00"
---

# A sled of mass M is released from rest at the top of a rough incline of height H and length L. The sled slides down the incline, experiencing a constant kinetic friction force of magnitude f, and reaches the bottom with speed v. Which of the following correctly describes the energy of a specified system as the sled slides from the top to the bottom of the incline?

A sled of mass M is released from rest at the top of a rough incline of height H and length L. The sled slides down the incline, experiencing a constant kinetic friction force of magnitude f, and reaches the bottom with speed v. Which of the following correctly describes the energy of a specified system as the sled slides from the top to the bottom of the incline?

![A side-view diagram of a sled of mass M at the top of an inclined plane. The vertical height from the base to the top is labeled H. The diagonal length of the incline surface is labeled L. An arrow parallel to the incline points downward, representing the direction of motion. The ground at the base of the incline is indicated by a horizontal line.](https://nerd-notes.com/wp-content/uploads/ubq-frq-generated/stem-fig-1-1774089484-cpmr0q.jpg)

- **A.** The mechanical energy of the sled-only system remains constant because the work done by the gravitational force is an internal interaction.
- **B.** The mechanical energy of the sled-Earth system decreases because the external friction force does negative work on the system.
- **C.** The mechanical energy of the sled-Earth system increases because the positive work done by the gravitational force is greater than the negative work done by friction.
- **D.** The mechanical energy of the sled-Earth-incline system remains constant because the friction force is internal to the system.

*The answer key and step-by-step explanation are available to logged-in users at https://nerd-notes.com/ubq/109194/*