Jessi and Squeaks just got a new telescope, and they can't wait to check out the night sky! But there's just one problem: it's too heavy to bring up the stairs into the observatory! Join them as they learn about a simple machine that can help them solve their problem: the pulley!
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SOURCES:
http://www.primaryscience.ie/media/pd...
https://dbsenk.wordpress.com/2014/02/...
Смотрите видео Need a Lift? Try a Pulley! онлайн без регистрации, длительностью часов минут секунд в хорошем качестве. Это видео добавил пользователь SciShow Kids 08 Сентябрь 2016, не забудьте поделиться им ссылкой с друзьями и знакомыми, на нашем сайте его посмотрели 662,04 раз и оно понравилось 2.6 тысяч людям.