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.
This is Book 20 in the Young Explorer: My World of Science Series. See all Young Explorer: My World of Science books here.
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Angela Royston has written many books for young people, including books about people at work, animals, health and the environment.
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