Pulley

A pulley is a wheel on an axle or shaft enabling a taut cable or belt passing over the wheel to move and change direction, or transfer power between itself and a shaft.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 3.0

LEVERLAB

How things move — simple machines, mechanics, and hands-on STEM.

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Museum entries, images, and facts are drawn from Wikipedia and Wikimedia Commons, used under public-domain and Creative Commons licenses.