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Kids use simple machines every day without realizing it. Teeth are wedges and so are knives, forks, and thumbtacks. Many toys such as slides, which are inclined planes, and seesaws, which are levers, are also simple machines. Two appealing kids and their comical cat introduce levers, wheels, pulleys, inclined planes, and more, and explain how they work. This lively introduction to physics will get kids excited about how simple machines simplify our lives.
作者簡介
David A. Adler is the best-selling author of many children's books, including Things That Float and Things That Don't, which was an Outstanding Trade Science Book for Children and one of Booklist's Top 30 choices for the K–8 classroom. He lives in New York.
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