Wheels (Simple Machines)

"Readers learn how this simple machine makes it easier to move things from one place to another. They also learn a wheel works with an axle. By the end of the book, readers know the difference between complex and simple machines and how wheels are used in everyday life to make work easier."--Publisher's website Presents a look at wheels, explaining how these simple machines work and how they have been used throughout history. Tools and machines -- Wonderful wheels -- Far and fast -- Easy does it -- Great gears -- A world of wheels.