Wheels and Axles to the Rescueby Sharon Thales
Rollerblades, bikes, and cars have wheels and axles that help you get from one place to another quickly. Read Wheels and Axles to the Rescue to learn what wheels and axles are, how they work, and how these simple machines can save the day.
Gr 2-3 - These brightly colored, attractive books discuss how simple machines are a means for solving many practical problems. In language students can read and understand independently, each one explains that simple machines have "one or no moving parts. Machines are used to make work easier. Work is using a force to move an object." The parts of each type of machine are named, and large, clear color photos with labels indicate where they appear. In Levers, for example, the blades on a pair of scissors cutting paper are labeled as the "effort" component, the screw holding them together as the "fulcrum," and the paper as the "load." Inclined Planesshows how ramps have been used for raising and lowering things for thousands of years, and how skateboard ramps, playground slides, and roller coasters provide fun today. The third title shows how wheels and axles are used in the potter's wheel, bikes, doorknobs, etc. Each book briefly defines all six kinds of simple machines and discusses a complex machine that combines several of them. An easy experiment that demonstrates how the target item works is included and requires only commonly found materials. Leaving out the mathematics involved in more technical discussions of simple machines, these books are good introductions to the topics with many examples from the real world. They make physics fun.-Lynda Ritterman, Atco Elementary School, NJCopyright 2007 Reed Business Information
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