Pulleys and Gears (Simple Machines, Heinemann) by David Glover Former library book; May have limited writing in cover pages. Pages are unmarked. ~ ThriftBooks: Read More, Spend Less
SynopsisIntroduces the principles of pulleys and gears as simple machines, using examples from everyday life., How can pulling down make something go up? How do carnival rides work? What makes the hands on a watch go around? How does pedaling a bicycle make it move? This title shows you how different kinds of these two simple machines are all around you to make your work and play easier.