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Introduce young scientists to the basics of pulleys. Through charming illustrations and simple, easy-to-follow text, this nonfiction book introduces pre-readers to the benefits of these engineering marvels, providing everyday examples of a flagpole, a crane, an elevator, and... Read Full Overview

Introduce young scientists to the basics of pulleys. Through charming illustrations and simple, easy-to-follow text, this nonfiction book introduces pre-readers to the benefits of these engineering marvels, providing everyday examples of a flagpole, a crane, an elevator, and... Read Full Overview

Una polea es una m quina simple. Las m quinas simples facilitan el trabajo, como levantar cargas pesadas o mover cosas de arriba a abajo. Las poleas nos ayudan a levantar cosas que no podemos levantar solos. Qu m s puede hacer una polea?