Screws

Readers learn how this simple machine makes it easier to keep objects locked together. By the end of the book, readers know the difference between complex and simple machines and how screws are used in everyday life to make work easier.

Tools and Machines	p. 4
A Kind of Ramp	p. 6
Parts of a Screw	p. 8
Spinning Circles	p. 10
Thread Power	p. 12
Pitch	p. 14
Screws and Bolts	p. 16
In Complex Machines	p. 20
Screws Everywhere	p. 22
Glossary	p. 24
Books and Web Sites	p. 24
Index	p. 24
Table of Contents provided by Ingram. All Rights Reserved.

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Summary

Table of Contents

Supplemental Materials