The ground pushes forward with equal force.

地面给他们一个同等的向前的推动力。

And that's because the desk is exerting an equal and opposite force on you.

我们真正理解牛顿在谈论什么我们真正理解牛顿在谈论什么。

If you exert a force on an object, it exerts an equal force back on you.

如果你对某一个物体施加了外力，这个物体也将会反过来对你施加同样的力。

By exerting a force downward, an equal and opposite force pushes upward, and the object accelerates.

通过施加一个向下的力，将会产生一个同等的并且反向的向上的推动力，这个推动力促使物体加速运动。

But direct evidence that it's exerting an equal and opposite force-- is that my hand will get compressed.

我们真正理解牛顿在谈论什么我们真正理解牛顿在谈论什么。

Justice fell on all with equal force.

正义以同等的力量降临到所有人身上。

The acceleration equals the net force divided by the mass.

加速度等于净力除以质量。

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

所以这必须等于重力向下拉。

So what is the equal and opposite reaction force?

那么什么是大小相等、方向相反的反作用力呢？

It is extremely tempting to react with equal force.

用同样的方式进行回击非常地诱人。

This has to equal the force of gravity. That has to equal this or this point.

这必须等于重力。那必须等于这个或这个点。

But there's an equal and opposite force of the Moon acting on Earth.

但月球对地球有一个相等且相反的力。

And it's applying an equal force right back on my finger -- one that I can actually feel.

他对我的手指施加同样的力量 … … 一种我能感觉到的力量。

And that is the equal and opposite force that the table is putting on your finger.

这就是桌子施加在您手指上的相等且相反的力。

There'd have to be an equal and opposite force instantly transmitted backwards, on my foot.

在我的脚上，必须立即向后传递一个相等且相反的力。

But as it does that, there's an equal and opposite force that the molecules are exerting on the rocket.

但当它这样做时，分子会对火箭施加一个相等且相反的力。

The electric field equals the electrostatic  force divided by the charge on the small, positive test charge.

电场等于静电力除以小正测试电荷上的电荷。

For every force, there's an equal and opposite reaction force.

对于每个力，都有一个大小相等且方向相反的反作用力。

So negative 2.45 meters per second squared is gonna equal the net force on the five kilogram mass.

所以每平方秒负 2.45 米等于 5 千克质量上的净力。

Which just means that if you exert a force on an object, it exerts an equal force back on you.

这意味着如果我们用力 出于某种原因，这对我们产生了类似的影响。