There is a gravitational force.
有一个重力作用。
This is the gravitational potential energy.
这是重力势能。
Notice the gravitational potential energy goes down.
注意，重力势能，是减小的。
Notice that the gravitational potential energy increases.
注意，这里，重力势能是增加的。
In art I want to be free from the earth's gravitational pull.
在摄影作品中，我想脱离地心引力。
A black hole exerts a strong gravitational pull.
黑洞产生了很强的引力。
Their gravitational pull is so strong, they absorb light.
黑洞的万有引力很强，能把光线吸进去。
Why is it that only they can create a gravitational wave?
只有他们能产生引力波吗？
Which of them show the effect of gravitational attraction?
以下哪项显示地心引力的效应？
A gravitational lens is formed when light is bent by a massive object.
引力透镜现象就是光被巨大质量物体弯曲的现象。
That was well known, and is caused by the gravitational pull of Venus.
那个发现曾引起巨大轰动，并且被普遍认为是由金星的引力引起的。
Just how powerful was the gravitational pull of the City, though?
可是，金融城的吸引力到底有多大？
And we write, often for that gravitational acceleration, the letter "g".
我们通常，用字母g表示，重力加速度。
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 black hole exerts a strong gravitational pull and yet it has no matter.
黑洞产生很强的引力，而它却没有物质。
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。
This is usually an object that moves in response to a gravitational field.
通常是一种受重力作用移动的物体。
Those are the edges of design and it's where we feel a gravitational pull.
这些都是处在设计边缘的重大挑战，对我们来说有着极强的吸引力。
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。
Build your own system of heavenly bodies and watch the gravitational ballet.
建立自己的天体系统，并观看重力芭蕾。
N: Is that because the earth is more massive and so has greater gravitational pull?
尼基：是不是因为地球比较重，地心引力也就比较大？
The water tunnel of gravitational type is driven by the water's potential energy.
水洞种类之一的重力式水洞依靠水的势能来提供动力。
This problem demonstrates why the energy density of gravitational field is negative.
本题演示为何重力场的能量密度是负的。
The strength of the gravitational wave determines how much an object will change in shape.
引力波的强度决定了物体形变的程度。
Elevator "Thought Experiments"; Gravitational Red Shift, Light Bending.
电梯思想实验，重力红移，光弯曲。
Gravitational wave is one of the important deductions of General Relativity.
引力波是广义相对论的重要推论之一。
Gravitational wave detectors are incredibly sensitive to the tiniest change in distance.
重力波探测器对距离上极微小的变化都非常敏感。
Gravitational wave detectors are incredibly sensitive to the tiniest change in distance.
重力波探测器对距离上极微小的变化都非常敏感。
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