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Topic – Changing Direction: Rack and Pinion

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Read the Following Selection

Read the following selection, or click on the play button below to listen aloud.

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!

Use the diagram above to complete some questions about the reading selection by clicking “Begin Questions” below.