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。

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For velocity in the x, y, or z direction.

对于x，y，或z三个方向的速度。

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The motion is only in the x-axis, along the x direction.

只在x轴，沿着x轴的方向进行移动。

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of the force in the x direction.

若只在y方向移动。

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of the force in the x direction.

若只在y方向移动。

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