Sun and planet gear

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/sun-and-planet-gear

1. Who invented Sun and planet gear?
2. What is the patented by?
3. What is the key principle?
4. How does the sun and planet gear turn up-and-down motion into spinning motion?
5. Why was the sun and planet gear important during the Industrial Revolution?

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. Who invented Sun and planet gear?William Murdoch
2. What is the patented by?James Watt (October 1781)
3. What is the key principle?Conversion of reciprocating motion to rotary motion via an epicyclic gear train
4. How does the sun and planet gear turn up-and-down motion into spinning motion?The sun gear is driven by a back-and-forth input, and the planet gears sit on a carrier that also moves. As the planet gears spin on their own and orbit the sun gear, the carrier ends up turning in a smooth, continuous way.
5. Why was the sun and planet gear important during the Industrial Revolution?Before it, steam engines only made up-and-down movements, which were hard to use for machines that needed constant spinning. The gear let engines power things like textile machines and mills, helping factories grow faster.

Epicyclic Gear Train: A system of gears where one or more gears orbit around a central gear.
Reciprocating Motion: Linear motion that alternates in direction, characterized by back-and-forth movement.
Rotary Motion: Circular motion around a fixed axis, essential for driving rotating machinery.
Industrial Revolution: A period of profound technological, socioeconomic, and cultural change marked by industrialization.