screws

"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.

An exploration of screws, covering how they are used, their design, how they work, and more.

The saw cuts, the hammer hits, and the drill makes holes; so Drew needs a job too.

"Is it easier to move ice with a lever or a screw? Readers will see how a group of kids compares two simple machines and decides which one does a better job at moving the ice."--Provide by publisher.

Presents facts and photos about how screws work. Includes a glossary, index, and resources for further information.

Introduces young scientists to screws, with historical and contemporary examples, and step-by-step projects that range from the simple to the more challenging.

Provides an introduction to screws, examining how they work, different types, and includes experiments using screws.

Text and photographs showcase screws, from their various parts, to how these devices are used.

Illustrations and text describe different examples of the use of simple machines known as screws.

Explains that screws are simple machines; describes their functions, including gripping, squeezing, connecting, and moving; and includes two hands-on activities.