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。

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

现在考虑更多的例子。

That would change the normal force.

知道了我刚给的那些条件。

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

方向像这样。

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。

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。

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。

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

是向上49牛顿。

We will not draw the normal force up.

我们不会绘制法向力。

That's a vertical force, it wouldn't affect the normal force this time.

那是垂直力，这次不会影响法向力。

Also note, gravity's not even affecting the normal force this time.

另请注意，这次重力甚至不会影响法向力。

And so you also have a normal force.

所以你也有法向力。

So, the force normal  is to the right.

因此，力的法线是向右的。

It just so happens that this horizontal force depends on a vertical force, which is the normal force.

碰巧这个水平力取决于垂直力，这是法向力。

And the force normal acts to the right from the wall on the book.

并且法向力从墙壁作用于书的右侧。

There is an  equal but opposite force normal which acts to the left from the book on the wall.

有一个大小相等但方向相反的力作用于墙上书的左边。

The surface is causing a force normal  on the book which is normal, or perpendicular, to the surface and a push.

该表面对书本产生一个法向力，该力垂直于表面，并产生推力。

The equation then is the force of static  friction is less than or equal to the coefficient of static friction times the force normal.

那么方程就是静摩擦力小于或等于静摩擦系数乘以法向力。

The maximum force of static friction which would prevent an object from sliding  on a surface is the force of static friction maximum equals the coefficient of static friction  times the force normal.

阻止物体在表面滑动的最大静摩擦力是静摩擦力最大值等于静摩擦系数乘以法向力。