Hi guys, I read about inertia on various websites and my textbook but I don't quite understand it. I just don't get the general understanding of it. I read that mass is the only variable, however since F=ma, and a=0 so won't there be no variables? My teacher gave us this question: you push an object on the moon and the earth which is harder to move. I thought it was earth as friction is greater. But the answer was the same as inertia is dependant only on mass. I hope you guys can clear out any misconceptions and help me understand thus. Thanks so much for all the help!