共 84 条公开笔记
伽利略奠定了现代科学的方法论基础，同时，他的重要发现也奠定了现代力学的基础
顿将它列为力学的第一定律，又叫惯性定
这条定律认为，任何物体在不受力的状态下保持静止不变或者做匀速运动
伽
利略开启了现代科学的实验传统，并且利用实验初步建立了现代力学体系。
开普勒认为天体的运动轨道是椭圆形的
开普勒第二定律认为，行星连接太阳的那条线在相等的时间内扫过的面积相等。
什么是角动量？就是行星的质量乘以行星的速度再乘以行星到太阳的距离得出的结果。
什么意思呢？既然行星的速度与它到太阳的距离的开方成反比，那么行星的动能就与距离本身成反比。
聪明的同学马上会跳起来说，行星的万有引力势能也与距离成反比，这不就是万有引力定律吗？
普勒第三定律是指行星公转周期的平方与它到太阳的距离的立方成正比（该距离是指行星的椭圆轨迹长轴长度的一半）。
角动量守恒 开普勒是在1609年发表第一和第二定律的，
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