Beskrivning
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.
Bokdetaljer
Format
e-bok
Sidor
25 sidor
Språk
Engelska
Publicerad
aug 1, 2009
Förlag
Bellwether Media
Upplagor
2 utgåvor
ISBN-10
1612115047
ISBN-13
9781612115047