"Why are some things hard to push? Read this book to find out about how pushing makes things move. Books in this series introduce children to simple forces. Each book uses simple, repetiti
"What makes something move fast? Read this book to find out about how and why things move quickly. Books in this series introduce children to simple forces. Each book uses simple, repetiti
"Which things move slowly? Read this book to find out about how and why things move slowly. Books in this series introduce children to simple forces. Each book uses simple, repetitive text
