What are pulleys? How do pulleys work? Do boats have pulleys? For the answers to these and many other questions, read 'Pulleys'. See how pulleys often work in pairs. Learn about the pulleys that make elevators work. Discover how pulleys are used in washing machines.
Publisher: Chicago, Ill. : Heinemann Library, 2003
Branch Call Number: JEN 621.8 OXL
Characteristics: 32 p. : col. ill. ; 23 cm