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.
Book Details
Format
eBook
Pages
25 pages
Language
English
Published
Aug 1, 2009
Publisher
Bellwether Media
Editions
2 editions
ISBN-10
1612115047
ISBN-13
9781612115047