So we have the force of gravity pulling down.

重力是向下的。

It looks like I have 49 newtons of force pulling this thing downwards.

看起来有个49牛顿的重力把它向下拉但是你们说 不。

Gravity is not a force pulling us towards the centre of the Earth like a giant magnet.

引力并不像那种把我们拉向地心的巨大磁铁的吸力。

Until the force of collisions with air molecules is equal to the force of gravity pulling it down.

直到与空气分子的碰撞力等于将其拉下的重力。

At times, it can seem like the forces pulling us apart are stronger than the forces binding us together.

离心的强大力量有时要大于团结一心的力量。

So that has to equal the force of gravity pulling down.

所以这必须等于重力向下拉。

Weight is the force pulling an object down to earth on account of gravity.

重量是由于重力将物体拉向地面的力。

They have to generate a force that acts against the gravity pulling them down.

它们必须产生一种力来抵抗将它们向下拉的重力。

Yet, for every stride forward, there seemed to be forces pulling the nation back.

然而，每向前迈出一步，似乎就有一股力量将这个国家拉回来。

But it had to be a lot smaller, or else you’d see a force pulling together most everyday objects.

但它必须小得多， 否则你会看到一股力量将大多数日常物品拉在一起。

But it had to be a lot smaller, or else you'd see a force pulling together most everyday objects.

但它必须小得多，否则我会看到 一种能吸引你每天看到的大部分物体的力量。

Well, a slope will slide when the force of gravity pulling it down becomes greater than the force of friction holding it up.

好吧，当向下拉斜坡的重力大于保持斜坡向上的摩擦力时，斜坡就会滑动。

For one, what we perceive as gravity — the force pulling two objects together — was actually just a bending of this fabric of space, a warp.

首先，我们所感知到的引力——将两个物体拉在一起的力——实际上只是空间结构的弯曲。

But more protons in the nucleus also means more force pulling the electrons in, so the electrons have to go faster and faster the bigger the nucleus gets.

但是原子核中更多的质子也意味着更多的力将电子拉进来，所以原子核越大，电子必须运行得越来越快。

In type 2, the star runs out of nuclear fuel, so the gravitational forces pulling in overwhelm the quantum mechanical forces pushing out, and the stellar core collapses under its own weight in a hundredth of a second.

在类型 2 中，恒星耗尽了核燃料，因此向内拉的引力压倒了向外推出的量子力学力，恒星核心在百分之一秒内因自身重量而坍塌。