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Lesson 10 – Changing Direction: Rack and Pinion

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Read About Rack and Pinions

Vocabulary

Read the vocabulary terms to understand the reading better.

A pinion is a spur gear that moves clockwise and counter-clockwise.

A rack is a flat, straight piece with spurs.

Changing Direction: Rack and Pinion

What is a rack and pinion system? The pinion is a spur gear. The rack is a flat, straight piece with spurs. The teeth on the spur gear fit between the teeth on the rack.

The pinion moves clockwise and counter-clockwise to move the rack back and forth. The circular motion of the pinion is turned into the back-and-forth motion of the rack.

Some buckles use a rack and pinion. You might have one on your skates or other sports equipment. A handle moves the pinion. The pinion moves the rack. The rack pulls the buckle tight.

Now Show What You Know!

Complete some questions about the reading selection by clicking “Begin Questions” below.