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。

SLIM electric motors are constructed to minimize the normal force.

单面直线感应电机在构造上使正交力最小化。