Why Do Swings Swing? Level 4 Factbook Peter Rees

A series of twenty non-fiction science readers which engages children in the world around them. Why do swings swing? Why do swings stop swinging? What makes things change direction? You can find the answers to these and other questions about movement in Why Do Swings Swing? Это и многое другое вы найдете в книге Why Do Swings Swing? Level 4 Factbook (Peter Rees)