大学 物理 2.牛顿第二定律 "The change of motion is proportional to the motive force impressed,and is made in the direction of the right line in which that force is impressed.” 运动的变化与所加的动力成正比，并 且发生在这力所沿的直线的方向上。 2.牛顿第二定律 “The change of motion is proportional to the motive force impressed, and is made in the direction of the right line in which that force is impressed.” 运动的变化与所加的动力成正比，并 且发生在这力所沿的直线的方向上。 6 大学 物理