Some of the first gears we know about were created more than two thousand years ago by the Chinese and the ancient Greeks. Gears are simple but very useful machines that transfer force from one gear to another. They’re used in everything from mechanical clocks to kitchen mixers and oil rigs.
The bumps on gears are called teeth or cogs, and the cogs of one gear mesh with the cogs of another. A collection of several gears in a row, like the one in the gear caterpillar we made, is called a gear train. You can find gear trains in the transmission systems of cars.
This project and more like it are featured in Liz’s new book STEAM Lab for Kids: 52 Creative Hands-On Projects Using Science, Technology, Engineering, Art and Math (Quarry Books, spring 2018).
© Quarry Books, 2018/STEAM Lab for Kids; photos © Quarry Books