But anyway, what is the net force now?

不纠结 合力是多少呢？

So essentially, what is the net force on this object?

所以实际上 作用於这个物体上的合力是多少？

We know that the net force is 83 Newtons down.

我们知道合力是向下83牛顿。

So what are the net forces in the x direction?

所以x方向上的合力是多少？

Droplets suspended in a vertical wind tunnel are experiencing the same net forces as falling raindrops.

悬浮在垂直风洞中的水滴正在经历与下落雨滴相同的净力。

So in this situation there is a net force in the rightward direction.

现在考虑更多的例子。

A 1 N force to the right or 1 N net force.

现在考虑更多的例子。

Well the net force is-- and you can ignore what I said before about the net force in all the other places.

合力是 你们可以忽略其他地方的合力。

So you have zero net force, these right here are balanced.

现在考虑更多的例子。

An object floating in a wind tunnel is experiencing the same net forces as an object falling at terminal velocity.

漂浮在风洞中的物体正在承受与以最终速度下落的物体相同的净力。

Or their must not be any net force.

或者肯定没有合力。

So maybe that's the net force that's causing the move.

不要认为 运动就存在合力作用 记住 这非常重要。

Because they're balanced there is no net force and this rock isn't going to accelerate.

现在考虑更多的例子。

So once again what is the net force here?

首先还是看合力是多少？

The acceleration equals the net force divided by the mass.

加速度等于净力除以质量。

The  net force is still down, holding the structure in place.

净力仍然向下，将结构固定到位。

So once again these are all balanced forces or there's no net force going on right over here.

现在考虑更多的例子。

Mass times acceleration is just what the net force happens to equal.

质量乘以加速度恰好等于合力。

So for example, we have a net force acting leftward on this large asteroid.

例如，我们有一个净力作用在这颗大小行星上向左。

We  are going to use that fact to determine the net force acting on our hypothetical cube.

我们将利用这一事实来确定作用在我们假设的立方体上的净力。