Pulleys: Elementary Level (Heinemann English Readers)
By Chris Oxlade.
Description
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. - from Amzon
ISBN(s)
0435294679, 9780435294670
