Smooth and Rough

Why are pans and plates smooth? Why do tires have treads? What is friction? Read 'Smooth and Rough' to find out! Learn what materials are naturally smooth, why some smooth surfaces are slippery, and how friction affects speed. Each book in the 'My World of Science' series explains science that you see in the world around you and use every day.

What Is Smooth?	p. 4
What Is Rough?	p. 6
Naturally Smooth	p. 8
Smooth Cloth	p. 10
Smooth and Hard	p. 12
Easy to Clean	p. 14
Making Something Smooth	p. 16
Slipping and Sliding	p. 18
Wet Surfaces	p. 20
Treads	p. 22
Friction	p. 24
Testing Surfaces	p. 26
Using Rough Surfaces	p. 28
Glossary	p. 30
Answers	p. 31
More Books to Read	p. 31
Index	p. 32
Table of Contents provided by Ingram. All Rights Reserved.

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Summary

Table of Contents

Supplemental Materials