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牛顿定律(第1页)

章节目录保存书签

牛顿定律

牛顿运动定律由三条定律组成

第一定律

任何物体都保持静止或匀速直线运动状态

直到其他物体对它的作用力迫使它改变这种状态为止

第二定律

物体受到外力作用时

物体所获得加速度的大小与合外力成正比

与物体的质量成反比

加速度的方向与合外力的方向相同

第三定律

两物体之间的相互作用力总是大小相等

方向相反,且作用在一条直线上

三条定律一共122个汉字

共同构成了牛顿力学的完整理论体系

而万有引力定律说的是

任何两个物体之间有引力

引力和距离的平方成反比

和两个物体质量的乘积成正比

他的朋友哈雷先生根据这个定律

推算出1682年出现过的那个大彗星

将会在1758年再次出现

1758年

彗星出现在茫茫夜空

的时候

哈雷先生已经死了十几年

1986年

我十二岁

守在窗口等哈雷彗星

但没等到就睡着了

中国历史上关于这颗彗星的第一次记载

最早可能是公元前1057年

当是时也

周武王伐纣

章节目录

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