Publisher's Synopsis
Three children are pushing, pulling and riding in their pedal car. They find it hard to push and pull uphill and easy to push and pull downhill. This gets them thinking about the forces involved. The book then goes on to look at a variety of machines that push and pull.;The book is part of a series of first information books for beginning and developing readers. The series is grouped into four levels by interest and readability, and at each level the list is further subdivided into smaller, topic based series.
