Descripción
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.
Detalles del libro
Formato
Libro electrónico
Páginas
25 páginas
Idioma
Inglés
Publicado
ago. 1, 2009
Editorial
Bellwether Media
Ediciones
2 ediciones
ISBN-10
1612115047
ISBN-13
9781612115047