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by Kay Manolis

Editorial Reviews

Children's Literature - Carrie Hane Hung
A doorstop, an ax, and teeth have something in common. They are different forms of wedges, a simple machine that help people do work. Read about the principles of how wedges work so that a task is made easier with less effort. A diagram illustrates how a wedge works. There are several color photographs to illustrate the different types of wedges such as a jackhammer, knife, or even the bow of a boat. Some wedges lift and separate like a shovel or axe and some hold fast for example a doorstop. In additions, there is a brief chapter describing how a wedge is a part of complex machines. To help students understand the concepts and principles of wedges, teachers may need to supplement the reading with hands on activities. This book is part of the "Blastoff! Readers: Simple Machines" series with books covering other simple machines such levers, ramps, screws, wedges, and wheels. The text is rated as Blastoff Reader level 4 which indicates more text on the page, variety of sentence structures, and more content vocabulary. For additional resources, a list of a few books and a website is provided. Reviewer: Carrie Hane Hung

Product Details

Bellwether Media
Publication date:
Product dimensions:
6.70(w) x 9.10(h) x 0.30(d)
Age Range:
5 - 9 Years

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