Description
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.
Détails du livre
Format
livre numérique
Pages
25 pages
Langue
Anglais
Publié
août 1, 2009
Éditeur
Bellwether Media
Éditions
2 éditions
ISBN-10
1612115047
ISBN-13
9781612115047