Wheels and Axles in Action

The types and some uses of simple machines, concentrating on wheels and axles, are described in this easy-to-read science primer. The parts of a wheel and axle are outlined, information that’s followed by chapters on how the combination is really a kind of lever, the history and applications of this type of simple machine, and how it is used in everyday life now. The details build, adding up to more than is often expected in a book of this size. Photographs, showing, for example, a person turning a tap, are perfect illustrations of the science. Early physics curriculums will be well served by this introduction.