Dimensions
190 x 194 x 3mm
Simple Technology.
Illustrated by Mike Gordon.
Who designed the first wheels? Why do wheels need tyres? How do cogs move energy from one part of a machine to another? Full of simple experiments, this lively and informative book helps you to find out the answers, and the pictures give you lots of laughs along the way!
Each book in the 'Simple Science & Technology' series contains notes for parents and teachers.
