"Presents information on simple machines with a focus on screws. Explains what a screw is, how screws work, and includes examples of past and present uses. Intended for third to fifth grade students"--Provided by publisher.

Defines a screw and shows how it is used in everyday life

Presents a look at screws, explaining how these simple machines work and describing some common examples that have been used throughout history.

"Through carefully leveled text and powerful images, explores screws a useful simple machine"--

Screws are discussed with information about what they are, how they work, and different screws at work.