Opis
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.
Szczegóły książki
Format
eBook
Strony
25 stron
Język
Angielski
Opublikowany
sie 1, 2009
Wydawca
Bellwether Media
Wydania
Wydania: 2
ISBN-10
1612115047
ISBN-13
9781612115047