Tractive effort

High school (ages 12+)
Transportation

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Date:

Step 1 · Read the article

Open the article and read it at the level above. Then answer the questions below in your own words.

https://smallwhale.org/articles/tractive-effort

Write what each word means, using the article.

Do not copy the article. Write two things you learned, the way you would explain them to a friend.

Answers below are taken from the article’s stored facts, so they match what the student read.

1. What is the definition in railway engineering?The pulling or pushing capability of a locomotive
2. What is the method of derivation?Calculated theoretically from mechanical properties or obtained via controlled testing
3. How does a train pull so many cars?The locomotive turns its engine power into wheel rotation. The wheels grip the rails, and the friction turns that rotation into forward motion. The stronger the grip, the more cars it can pull.
4. Why is tractive effort important for freight trains?Freight trains need a lot of tractive effort to pull many cars. A strong pulling force lets them carry more cargo in one trip, which saves money and time. It also helps them climb hills without slowing down.

Adhesion: The frictional force between a locomotive's driving wheels and the rails, crucial for generating tractive effort.
Coefficient of Friction: A dimensionless scalar value that describes the ratio of the force of friction between two bodies and the force pressing them together.
Wheel Slip: A condition where the rotational speed of a locomotive's driving wheel exceeds its linear speed along the track, reducing tractive effort.