So the wire must be exerting some upward force on the object.

所以绳子一定对物体有个向上的力这就是拉力。

This wire is providing no upward force.

这根线不提供向上的力。

So what is going to be the upward force here?

那么这里的向上力量是什么？

When an object is immersed in the water, the water exerts an upward force called upthrust on the object in question.

当一个物体浸入水中时，水会对该物体施加一个向上的力，即向上的推力。

The buoyant force is an upward force acting on an object in a fluid.

浮力是作用在流体中的物体上的向上的力。

The upward force is called lift.

向上的力称为升力。

That's because the upward buoyant force is always stronger than the downward force of gravity.

那是因为向上的浮力总是强于向下的重力。

And pushing the air upward forces the ball in the opposite direction, changing its flight path.

向上推动空气会迫使球向相反方向移动，从而改变其飞行路径。

All you need is a powerful enough upward force to counteract the downward force of gravity.

您所需要的只是一个足够强大的向上力来抵消向下的重力。

The liquid in turn exerts an upward buoyant force equal to the weight of the fluid that's been displaced.

液体反过来施加向上的浮力，等于被置换的流体的重量。

But now, the counteracting upward force comes from the rope acting on the box, in what we call the tension force.

但现在，向上的抵消来自 盒子就是我们所说的张力。

Some might emphasize the air's behavior at the wing's surface, others the upward force created as the air is deflected downwards.

有些人可能会强调机翼表面的空气行为，其他人可能会强调空气向下偏转时产生的向上力。

Things that are lighter than air are buoyant within it, while heavier objects require an upward force, called lift, to stay aloft.

比空气轻的物体在其中有浮力，而较重的物体需要向上的力（称为升力）才能保持在空中。

On top of that, the upward force of a jet's arrival may lift up a ship, and then drop it, breaking its back.

最重要的是，喷气式飞机到达时产生的向上力可能会举起一艘船，然后将其掉落，从而折断它的背部。

So all of the upward force must be the y component or the upward component of this force vector on the first wire.

因此，所有向上的力必须是第一根线上该力矢量的 y 分量或向上分量。

And, again because pressure increases  with depth, the upward force acting on the bottom side is larger than the downward force acting  on the top side.

而且，由于压力随着深度的增加而增加，作用在底部的向上的力大于作用在顶部的向下的力。