Описание
Pulleys are simple machines used to lift and move loads. Builders use pulley systems to lift tools or materials up high and elevators go up and down with the help of pulleys. Kids will learn how pulleys make work easier and how they are often part of complex machines.
Детали книги
Формат
электронная книга
Страницы
25 страниц
Язык
Английский
Опубликовано
авг 1, 2009
Издатель
Bellwether Media
Издания
Изданий: 2
ISBN-10
1612115047
ISBN-13
9781612115047