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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 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.
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1. Turning a handle can open a window. The turning pushes a bar. The bar moves the window.
Which part is the pinion?CorrectIncorrect
2. Turning a handle can open a window. The turning pushes a bar. The bar moves the window.
Which part is the rack?CorrectIncorrect
3.How can a pinion tighten a buckle?CorrectIncorrect
4.In a buckle, what force makes the gears move?CorrectIncorrect
5. The pinion only moves clockwise.CorrectIncorrect