Describes five simple machines--lever, wheel, inclined plane, screw, and wedge--and explains how they work.
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Kindergarten-Grade 4-- Using crisply defined black-and-white photographs, this book imparts information about five of the six simple machines (the pulley is inexplicably omitted). Each simple machine is shown in everyday uses with children or children's hands manipulating it. For instance, a hammer claw, pry bars, a seesaw, and a pop-top can are all given as examples of a lever. Technical and necessary terms such as fulcrum, force, friction and plane are carefully defined in context, but there is no glossary. Some readers may not understand several things: if a picture of gears shows that "some wheels help other wheels move," why aren't any of the gears touching each other in the watch workings? If "all wheels need an axle," why doesn't this book call this simple machine by both parts rather than merely "wheel?" Other older and old-fashioned looking books such as Simple Machines and How They Work (Random, 1959; o.p.) by Elizabeth Sharp or Machines (Follett, 1962; o.p.) by Edward Victor still do a good but indexless job of describing the six simple machines. Yet, except for these rusty spots, Simple Machines looks current and works smoothly for casual browsers. --Susan Hepler, Arlington Public Library, Va.
Copyright 1989 Reed Business Information, Inc.
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Book Description Dutton Juvenile, 1989. Hardcover. Book Condition: New. Never used!. Bookseller Inventory # P110525444920
Book Description Dutton Juvenile, 1989. Hardcover. Book Condition: New. 1. Bookseller Inventory # DADAX0525444920