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.
タイトルや名前を忘れても、記憶から映画やドラマにたどり着ける検索プラットフォーム
