There is a gravitational force.
有一个重力作用。
And now we're going to multiply that by the gravitational force constant.
我们现在把这个结果，和重力常量相乘。
mg There's a gravitational force, which is mg, but there is also tension.
存在重力也就是，但是还存在张力。
A heavenly body kept in orbit around a planet by gravitational force.
一种因引力而沿轨道绕行星旋转的天体。
If they are three units apart the gravitational force between is one ninth.
如果有三个单位的距离，那么引力就是九分之一。
In fact, the moon's gravitational force is only one-sixth that of the Earth.
实际上，月球的引力只有地球引力的六分之一。
We are reluctantly accepted the gravitational force between matter and matter, even a look.
我们都在无奈中接受物与物之间的万有引力，甚至是一个目光。
slide-"Example: Newton's famous approximate formula for the gravitational force between two bodies.
幻灯片出现：牛顿著名的万有引力公式。
slide-"Example: Newton's famous approximate formula for the gravitational force between two bodies.
幻灯片出现：牛顿著名的万有引力公式。
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