So you have this counteracting normal force.

这个力，也就是平行於斜面的这个地心引力的分力。

And this is the normal force.

这个力，也就是平行於斜面的这个地心引力的分力。

So this is the normal force.

所以这是支持力。

So the normal force that I have to apply is 12.25 times the mass.

的支持力是12.25乘以质量所以这是我施加的力 乘以质量。

So you have the normal force is equal to 9.8 times the mass divided by 0.8.

所以支持力等於9.8乘以质量9.8除以0.8等於12.25 所以我施加。

So the ground is providing an upwards force or normal force in this situation.

现在考虑更多的例子。

5 N normal force of the ground supporting the rock.

现在考虑更多的例子。

The ground is providing a normal force, I'll do it in green.

现在考虑更多的例子。

We're sitting on the ground in the vertical direction, normal force counteracting the force of gravity.

现在考虑更多的例子。

And I have the normal force. The rock is being supported by the ground 5 N upwards.

现在考虑更多的例子。

I should say the magnitude of the normal force.

这可以通过实验来求。

That would change the normal force.

知道了我刚给的那些条件。

The force of gravity is being balanced by the normal force of the ground.

现在考虑更多的例子。

And there's still a normal force , the ground supporting the rock of 5 N upwards.

现在考虑更多的例子。

And we'll talk more about the normal force in future videos.

当任何物体放在任何平面上。

So maybe there's some normal force that's completely netting it out in this example.

如果没有维持它在斜面上的摩擦力如果没有维持它在斜面上的摩擦力。

And that's the normal force of the wedge on the block.

方向像这样。

This right here is the normal force.

我们会在以后的视频中对支持力讲述更多。

And this force, in this example, is called the normal force.

是向上49牛顿。

This is the normal force-- it's 49 newtons upwards.

是向上49牛顿。