This book is from the Simple Machine Projects series, which explains the physics behind simple machines using everyday examples, and gives children practical projects that demonstrate the science in action. This volume looks at how wheels and axles work together, the relation between friction and motion, and how gears work. Age 7–9
Chris Oxlade is the best-selling author of more than 150 non-fiction books, most of them explaining complex scientific ideas and modern technology to young readers in readable text.