If there had been a net force, then indeed it would also go down, if this force were larger than this.

如果没有净力，那就不会下降了，如果那个力大于这个。

youdao

And so the net, the sum of all forces on that object there is no net force on that wheel but there is a net torque, and that's why it's going to precess.

所以综合，物体受的所有力，车轮不会受到净力，但是有一个，净作用力，那就是我要推进的。

youdao

And if there is no net external force on the system as a whole during the collisions, then momentum is conserved.

若没有外力，作用于系统整体，在碰撞过程中，动量就是守恒的。

youdao

So, a massless body cannot have a net force on it, because the acceleration of the rope cannot be infinite.

所以没有质量的物体不会受到力,因为绳子的加速度不可能是无穷大

耶鲁公开课 - 基础物理课程节选

If the two forces don't cancel, you have a net force.

如果这两个力没有抵消,便会有一个净作用力

耶鲁公开课 - 基础物理课程节选

So, when we get really close together, granted, there is a net positive negative charge with a Coulombic force of attraction.

当它们真正离得很近时，假设有一个带正负电的电荷,带有库仑引力。

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