Explains the difference between weight and mass, and shows how only mass is the same on the moon and on the earth.
Aiutamo i ragazzi a fare da soli. (Maria Montessori)
Explains the difference between weight and mass, and shows how only mass is the same on the moon and on the earth.
Apri un sito e guadagna con Altervista - Disclaimer - Segnala abuso