Descrizione
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.
Dettagli del libro
Formato
eBook
Pagine
25 pagine
Lingua
Inglese
Pubblicato
ago 1, 2009
Editore
Bellwether Media
Edizioni
2 edizioni
ISBN-10
1612115047
ISBN-13
9781612115047