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第一百零二章 牛顿万有引力(1 / 2)

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发现三定律后,为何一个物体无法做出真正理想的运动,除了受到空气阻力以外,还有重力的影响,正是因为有重力所以才导致任何东西都会是抛物线的运动。而重力是怎么回事?

牛顿坐在苹果树下思考,突然掉下苹果砸到自己头上,牛顿的头被砸的很疼。

牛顿细想:“这是很神奇的事情,明明一起都是安静的,但是一个苹果可以打到我的头上,这一切是如何发生的。”

“为什么所有东西会往下落?”

“但是月球就不会往下落,而是横着走。”

“地球是圆的,月球也是圆的。月球绕着地球!”

牛顿似乎想到了什么。

“一个大炮,朝着正前方开炮,炮弹就会落地。炮弹速度越快,就会在越远的地方落地。而再要更远的话,那就会在有曲面的远处落地。再的变得更远,也许会到达地球背面才落地。那要打得更远的话,会不会绕地球一圈再从跑的后方飞来落地呢?”

“或许达到很快的一个速度的话,炮弹就不落地了,就一直绕着地球转。这不就像是此刻的月亮一样吗?”

“所以落地这个事情,就是地球对一切都有吸引力,而横向速度大的东西才没那么容易落地了。”

“所以地球对于一切东西,都有吸引力。”

“哥白尼认为地球绕太阳转动,所以太阳对地球也有吸引力。”

“因此地球、月球、太阳相互之间都有吸引力。可为什么呢?其他东西为什么不吸引呢?”

“为什么我身边的房屋、石头、大山河流不吸引呢?”

牛顿貌似又想到了什么,突然变得兴奋。

“不,他们也是吸引的。因为他们太小,只是看不出来而已。所以万事万物之间都是相互吸引的,有一个吸引力。所以地球、太阳和月球这种巨大的东西自身被吸成了球形,小的东西无法被自身吸引成球形,仅仅只能被大的东西吸引而已。”

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