Takes a look at ramps and wedges, what they are, how they are used, and how they help us.

Why do skiers use a zigzag path down steep slopes? How does a zipper work? How does a lock work? Ramp and wedges are simple machines that can be used to make ot

This series offers a clear introduction to simple machines - what they are, what they're made of, and how we use them in today's world. Exciting examples of eac

Explains how and why ramps and other inclined planes are used in everyday life.

Each book in this series focuses on a type of simple mechanism and examines how it is used to make different toys work. This book examines ramps and wedges, and