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第九十九章 牛顿创立三定律(1 / 2)

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巴罗准备要辞去剑桥大学卢卡斯数学教授席位,有几个候选人。

其中一个是牛顿,他想考察牛顿的知识。

巴罗见了牛顿,对牛顿开始刁难,想看看牛顿有多少斤两。“听说你最近在研究力学?是不是在浪费时间?很多人都因为自己了解力,但都是错误的。”

牛顿也不让步的说:“那是因为他们没有搞清楚本质。”

巴罗说:“德谟克利特、伊壁鸠鲁认为当原子在虚空里被带向前进而没有东西与他们碰撞时,它们一定以相等的速度运动。”

牛顿说:“这只是猜测或推想的结果。”

巴罗说:“亚里士多德说静止是物体的自然状态,如果没有作用力就没有运动.力是维持物体运动的原因。”

牛顿说:“该观点遗失了力能使物体停止运动,也能使物体开始运动这一关键点,故错误。倒是第一次提出了力与运动间存在关系,也算是对运动学有了一点点认识。”

巴罗说:“那你说说看,什么样的观点靠谱?”

牛顿说:“菲洛彭诺斯批判亚里士多德的运动学,他认为抛体本身具有某种动力,推动物体前进,直到耗尽才趋于停止。这就是冲力理论”。

巴罗说:“我知道冲力理论,推动者在推动一物体运动时,便对它施加某种冲力或某种动力,速度越大,冲力越大,冲力耗尽时,物体停止下来。”

牛顿说:“后来伽利略认为,如有一足够长而绝对光滑的表面,将没有摩擦力能阻碍小球运动,所以小球一直继续运动或者直到有外力阻碍它而停止。”

巴罗说:“物体在自然状态下会维持原有运动而非趋于停止。这打破了自亚里士多德以来约一千三百年间力是维持物体运动的原因的陈旧观念。”

牛顿说:“但仍未摆脱其影响。该结论很接近惯性定律。”

巴罗说:“惯性定律?”

牛顿说:“就是孤立质点保持静止或做匀速直线运动。”

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