00:14:32,640　　可恶　　我差点就解开bra了　　Damn, I was this close on the bra.　　314　　00:14:35,310 --> 00:14:39,940　　记住　　牛顿发现亚里士多德的理论是错的　　Now, remember, Newton realized that Aristotle was wrong　　315　　00:14:40,010 --> 00:14:42,310　　运动不需要靠力来维持　　And force was not necessary to maintain motion.　　316　　00:14:42,370 --> 00:14:45,440　　所以　　加上a = 9.8平方米每秒　　So let's plug in our 9.8 meters per second squared　　317　　00:14:45,510 --> 00:14:47,370　　我们能得到　　As "A" and we get　　318　　00:14:47,440 --> 00:14:51,040　　万有引力乘以质量　　Force-- Earth gravity- equals mass times 9.8 meters　　319　　00:14:51,110 --> 00:14:52,770　　等于9.8米每秒的平方　　Per second per second.　　320　　00:14:52,840 --> 00:14:55,270　　从而得到ma = mg　　So we can see that "ma" equals "mg"" type="audio/mpeg" />-->