Roll, Slope, and Slide: A Book About Ramps (Amazing Science: Simple Machines)
Simple Machines are simply fascinating in Michael Dahl's Amazing Science series. They explain how pulleys, wedges, ramps, wheels and axels, levers, and screws help people do work, making them an effective introduction to this key elementary concept. Imagi --NSTA RecommendsThese simple concept books are full of pizzazz and wonderfully illustrated with digital graphics that show kids doing typical kid things. The lumberman on the cover of Cut may not be as enticing as the active children depicted on the other titles. The boo --School Library Journal