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1·I'm applying Newton's Second Law.

可以用牛顿第二定律。

2·So now I can write down Newton's Second Law.

于是可以使用牛顿第二定律。

3·Newton's second law, the Momentum Principle.

牛顿第二定律，动量定理。

4·Now we come to the Second Law, Newton's Second Law.

下面我们讲牛顿第二定律。

5·Newton's second law can be expressed as a differential equation.

牛顿第二定律可表达成微分方程。

6·Second... Newton's Second Law: ma this is the only force in the x direction.

根据牛顿第二定理：,等于。，ma，equals。。。,这是x方向的,唯一一个力。

7·Newton's second law and the law of gravity are summarized with experimental results.

牛顿第二定律及万有引力定律是根据实验结果总结出来的。

8·We start with Newton's Second Law, at first referring our problem to an inertial frame.

我们从牛顿第二定律出发，并且先只涉及惯性系。

9·We can set a standard for one of them and use Newton's Second Law as the definition of the other.

我们可以给其中一个量规定标准，而利用牛顿第二定律来给另一个量确定标准。

10·The rocket equation is obtained for a constant specific impulse mission by integration of Newton's second law.

火箭方程式是为了源源不断的特定推进任务， 通过加入牛顿第二定律而得到的。