"Pulling up: the pulley explores the benefits and uses of the pulley. This clever device uses rope wound over a grooved wheel to help lift heavy loads. RobbO and RobbEE use a pulley to remove the engine from their car."--Page [4] of cover.
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Details
ISBN: 9780778704171 (hardcover)
Physical Description:32 pages : color illustrations ; 27 cm.print
Publisher:St. Catharines, ON :Crabtree Publishing,2014.