This book answers twenty questions about the different kinds of simple machines and how we use them in our daily lives.

Title proper from title frame. Includes index. Includes glossary. Book description - 24 p. : ill. (chiefly col.) ; 21 cm.

Simple yet helpful - What is work? - How common are simple machines? - What is a lever? - What does a lever do? - Is a seesaw a lever? - Are the wheels on my bike a simple machine? - How do we use wheels and axles? - What is a pulley? - How does it work? - Why do we need pulleys? - Is a ramp a simple machine? - What kind of work does an inclined plane help us do? - Are there other kinds of inclined planes? - Is a doorstop a wedge? - What are some other wedges? - What is a screw? - How does a screw work? - Are there other simple kinds of machines? - How long have people been using simple machines? - Do we still need simple machines today?.