Big or small, pulleys help you move it all. You couldn't raise a flag and cranes couldn't move heavy objects without the help of pulleys. Read Pulleys to the Rescue to learn what pulleys are, how they work, and how these simple machines can save the day.
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Big or small, pulleys help you move it all. You couldn't raise a flag and cranes couldn't move heavy objects without the help of pulleys. Read Pulleys to the Rescue to learn what pulleys are, how they work, and how these simple machines can save the day.
Read Less
Add this copy of Pulleys to the Rescue (First Facts: Simple Machines to to cart. $33.66, good condition, Sold by Bonita rated 4.0 out of 5 stars, ships from Hialeah, FL, UNITED STATES, published 2007 by First Facts.
