Descubra c?mo esta sencilla m?quina facilita la elevaci?n y la bajada de objetos. Aprenden sobre poleas fijas y m?viles y cu?ndo es mejor usar cada una.
"In the story of Rapunzel, the prince had to climb Rapunzel's hair to reach the top of the tower, but a pulley system would have been easier to use. Describes how pulleys work, and their uses. Includes a project to build your own pulley system and 'In the Real World' examples"--Provided by publisher.
Did you see a flagpole today? Then you’ve seen a pulley at work! These simple machines are all around. Take a look inside this book, and discover 13 different uses for pulleys.
A look at some of the most amazing elevators in the world. Addresses the obstacles of construction, the impact on society, and the science of engineering such superstructures.
"Relevant images match informative text in this introduction to pulleys. Intended for students in kindergarten through third grade"--Provided by publisher.
Text and pictures introduce the pulley, a simple machine used primarily to lift heavy objects. Includes audio, videos, activities, weblinks, slideshows, transparencies, maps, quizzes, and supplementary resources.
