Διαφορά μάζας και βάρους
Διαφορά μάζας και βάρους
Original Khan Academy video: Mass and Weight Clarification
https://www.khanacademy.org/science/physics/newton-gravitation/gravity-newtonian/v/mass-and-weight-clarification
Help us caption & translate this video!
http://amara.org/v/CL66/