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。
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。
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。
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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