TECHNOLOGY
Glover, David

Pulleys and Gears

(3) K-3 Simple Machines series. Machines couldn't be any simpler in this newly revised series that introduces six basic tools for making work easier. Clear, brief text accompanies pictures of everyday objects showing force applied, motion achieved, and effort reduced. The concepts behind levers are easiest to understand, while gears and pulleys are more challenging. Easy activities invite experimentation so kids can see for themselves how things work. Glos., ind. Review covers these Simple Machines titles: Levers, Pulleys and Gears, Ramps and Wedges, Screws, Springs, and Wheels and Cranks.

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