Smooth and Rough (Young Explorer: My World Of Science)
By Angela Royston.
Description
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. - from Amzon
ISBN(s)
0431137722, 9780431137728
