Science, Nature & How It Works, Reference 

This series is designed to introduce children to the technology around them in a way that is both informative and enjoyable. Clear, step-by-step instructions and illustrations show children how to make their own simple models. The text encourages them to investigate the scientific principles that make these models work. The books are specifically relevant to the National Curriculum and contain clear notes for parents and teachers. This book looks at machines such as levers, cranes, diggers, pulleys and our arms and legs. It suggests ways to make simple models of these machines and helps children to learn about the science that makes them work. Machines are an essential part of the modern world. This book uses simple and enjoyable technology projects to help children understand more about the many different kinds of machines and about how they help us to do work. Activities include making simple levers, diggers, cranes, pulleys, catapaults and switches. There is also work on the way our arms and legs act as machines. - from Amzon