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1·Is the normal force not doing any work?

法向力不做功吗？

2·Then we have a normal force here-- NQ I call that NQ.

这里有个法向力-,称之为。

3·And then there is the normal force perpendicular to the surface.

这个力，垂直于斜面。

4·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。

5·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。

6·Since there is no acceleration in the y direction, the normal force must be also mg cosine theta.

既然在y方向上,没有加速度，法向力也等于mgcosθ

7·The normal force is one of the key factors which affects the properties of a linear servo motor.

法向力是影响直线伺服电机运动性能的主要原因之一。

8·Every electrical contact is designed to provide a certain amount of normal force at the contact interface.

所有的电气触点都可以在接触界面提供一定量的法向力。

9·Is the tension doing any work and in the case of my circular track is, perhaps, the normal force doing any work?

张力做了功吗，在环形轨道的例子里，也许法向力做了功？

10·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。