levers

Explains what it means to balance, and looks at some of the things that balance on a construction site, including a sawhorse, ladder, scissor lift, and others.

An introduction to levers that describes their parts, functions, uses, and history.

Text and illustrations describe the simple machine known as a lever.

An introduction to six simple machines--the lever, the inclined plane, the screw, the wheel and axle, the wedge, and the pulley--and their use in more complex machines such as derricks, bulldozers, and metal lathes.

Text and photographs look at basic devices such as wheels, pulleys, levers, screws, and slopes, and suggest simple experiments and projects to demonstrate how they work.

Text and illustrations describe levers, a simple machine.

Photographs and simple text describe various objects that are levers and how they work.

This book describes different jobs that levers and pulleys can do and how they are able to do them. An activity based on real world situations challenges readers to apply what they've learned in order to solve a puzzle.

Presents an introduction to levers, in simple text with illustrations, describing how these simple machines work in everyday life.

Text and pictures introduce the lever, a simple machine used to change force and motion.