Put Wheels and Axles to the Test

November 1, 2011

Gr 3-5-The first two chapters in each title are nearly identical, although there are occasional changes in the photographs and the examples used to define the concepts work" and machines. Subsequent chapters feature a specific simple machine and provide directions for basic experiments that children can accomplish, with the occasional exception, on their own, using easily located items. Final chapters explain that simple machines are everywhere. On the whole, the texts provide clear explanations and the experiments add a significant degree of interest. The color photographs are crisp and clear, as are the diagrams. Serviceable additions where the topics are a part of the curriculum.

Copyright 2011 School Library Journal, LLC Used with permission.

December 1, 2011
Grades 3-5 This entry into the How Do Simple Machines Work? series begins with a catchy list of activities children consider work. Then the authors ask, What does the word work mean to a scientist? This opening chapter defines what is and is not work, while the latter four chapters move closer and closer to a complete understanding of the book's central concept. Machines describes things with moving parts, from a train engine to an office chair. Friction suggests an experiment involving sliding a book across a table. Parts of a Wheel and Axle supplies another experiment and examples of wheels and axles all around us. Finally, Gears takes the discussion one step further: Some wheels have teeth. The short sentences are a bit choppy, but the color photographs of multiethnic elementary children are engaging, and the activities are both simple and illustrative. Back matter includes a glossary, other resources, and an index.(Reprinted with permission of Booklist, copyright 2011, American Library Association.)