Investigating Pulleys

Away we go, investigating again. First we thought about the question, "What is a machine?" We decided that it is a thing that makes a job easier and quicker to do. We talked about simple machines and complicated machines. Then working in groups we used a rolling pin and string to lift a book. At first we pulled the book up by turning the rolling pin. We then tried again and discovered it was easier when we pulled down on the string in the same direction as gravity. Mmm interesting!