Newton's second law of motion 牛顿第二运动定律 ; 牛顿运动第二定律 ; 牛顿第二定律 ; 活动定律
second law of motion 运动第二定律 ; 第二运动定律
Newton second law of motion 牛顿第二定律
Newtons Second Law of Motion 牛顿第二运动定律
So, what Kepler's second law says is that the motion of planets is, first of all, they move in a plane.
开普勒第二定律说到，首先每个行星的运动都保持在同一平面内。
Turns out, some of these equations were very familiar: the law of conservation of momentum, and Newton's second law of motion.
其结果，其中一些方程非常眼熟，比如动量守恒定律和牛顿第二定律。
That would that would give rise to a perpetual motion machine, breaking of the second law. It can't happen.
否则就会使，得永动机出现，打破第二定律那是不可能的。
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