Is the normal force not doing any work?
法向力不做功吗？
Then we have a normal force here-- NQ I call that NQ.
这里有个法向力-,称之为。
And then there is the normal force perpendicular to the surface.
这个力，垂直于斜面。
So there is no force along the arc, but there must be a normal force.
所以在弧线上没有力，但是肯定存在法向力。
Enhancement of the vortical effect can benefit both the side force and the normal force.
涡系诱导作用增强，对侧向力和法向力都有增值。
in the minus y direction and there is a normal force in the plus y direction and these two exactly cancel each other.
,在y的负方向,那么也有一个常力,在y的正方向,这两个力互相抵消。
The third is the normal mutual trasfer of labor force between cities and villages.
第三是正常开展城乡之间的劳动力交流。
As a normal material magnet can make force with iron.
一种常态的磁体可以和铁产生力量。
As a normal material magnet can make force with iron.
一种常态的磁体可以和铁产生力量。
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