Under the control of the Sun's gravitational force, each planet maintains an elliptical orbit and all of them travel in the same direction.
在太阳引力的控制下，每个行星都维持在一条椭圆形的轨道上，并按照相同的方向移动。
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。
Newton's law of gravity; Gravitational force from a shell; Hooke's 'law'.
克普勒圆周轨道第三定律；利用积分推导球壳的引力；弹簧。
This strong connection is like a gravitational force on a higher dimension.
这种强烈的关系，就好像更高维次里的万有引力。
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。
So if we apply that concept, then we first have to know what is the gravitational force.
如果我们运用这概念，我们必须先知道，引力是什么。
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。
Thanks to Newton's universal law, we can figure out the gravitational force between any two objects.
正是有了牛顿的万有引力定律，我们才能计算出任意两物体间的引力。
The gravitational force acting on an object at the Earth's surface is called the weight of the object.
作用于地球表面上物体的引力，叫做物体的重量。
Newton's problem was to express in mathematical terms the gravitational force between different bodies.
牛顿的目标是要用数学形式来表示不同物体之间的引力。
In addition, the Bridges act as large diagonal trusses, which transfer gravitational force to the ground.
此外，桥梁也作为一个大的交叉桁架，将受力传送到地面。
A Normally I write an "a" for it, but I make an exception now because gravity, I call it "gravitational force."
一般加速度写作，但这儿是个例外，因为涉及到重力。
The Earth's gravitational force or pull keeps us and everything else on Earth from floating away to space.
地球的引力或拉力，使我们和地球上别的任何东西都不致飘浮到空间去。
And there has to be here a force on the system, the gravitational force, which is the same as the centripetal force.
这个系统中，存在重力，和向心力相等。
And so you see that the gravitational force due to the earth on a particular mass is linearly proportional with the mass.
你知道重力由地球产生，它与物体质量，成正比。
In one direction there is a constant gravitational force, in the other very many irregular blows from the molecules.
在一个方向上有不变的重力在作用，在另一个方向上则是分子的大量不规则的碰撞。
And it's important conceptually because a lot of the forces are gradients of potentials, namely, gravitational force, electric force.
这在概念上很重要，因为很多力都是势场的梯度，比如重力场，电场。
Gravitational field is a kind of vector field, and the description of gravitational force by general relativity is very effective.
引力场是一种矢量场，广义相对论对引力问题的描述是非常有效的。
"Cook Aims to Provide Jobs's 'Gravitational Force' at Apple," by Adam Satariano and Peter Burrows, Bloomberg Businessweek, Aug. 25, 2011.
Cook志在在苹果为Jobs提供“万有引力”，AdmSatarian和PeterBurrows说，《商业周刊》，2011.8.25。
At this time the Suns gravitational force partially offsets the Moons gravitational force causing lower than normal tides called neap tides.
这时，太阳的部分引力抵消月亮的引力，形成比平常还低的潮水，称为小潮。
For those of us on Earth (basically all of us, ISS-crew excepted), the moon's gravitational force is most evident in the way it influences the tides.
对于生活在地球上的人而言(所有的人，除了国际太空站的工作人员以外)月球引力最显著的表现就是对潮汐变化的影响。
Another key purpose that our moon serves is that its gravitational force stabilizes earths axis with respect to earths plane of orbit around the sun.
月球也有另一个主要功用：它的引力使地球的轴心跟地球绕太阳运行的轨道平面保持一定的倾斜度。
Another key purpose that our moon serves is that its gravitational force stabilizes earths axis with respect to earths plane of orbit around the sun.
月球也有另一个主要功用：它的引力使地球的轴心跟地球绕太阳运行的轨道平面保持一定的倾斜度。
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