Differential pulley

High school (ages 12+)
Science & Technology

Name:

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/differential-pulley

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 device classification?Manual lifting device, specifically a differential pulley system (Weston type)
2. What is the historical context?Developed in the mid-19th century, significantly improving upon earlier manual lifting methods
3. How does a differential pulley lift heavy things?When you pull the chain, the larger pulley moves more chain than the smaller pulley lets go, so the load rises with less effort than pulling directly.
4. Why is the size difference between the pulleys important?The closer the two pulley sizes are, the greater the mechanical advantage, meaning you need less force to lift the same weight.

Torque: The rotational equivalent of linear force, crucial for understanding how pulleys lift loads.
Friction: A force opposing motion, which contributes to the load-holding capability of the differential pulley.
Load Capacity: The maximum weight a differential pulley is designed to safely lift, determined by its construction and pulley ratio.