It's always opposing the velocity, so this is the magnitude of the resistive force.

总是和速度相反，这是阻力的大小。

youdao

If an object moves through a medium — - air or a liquid — there is a resistive force which always opposes the velocity.

如果物体通过媒介-，比如说空气或者液体-，都会遇到阻力，阻力总是和速度相反。

youdao

The wave washers (56) apply a resistive force against axial movement of the clutch disk (38) from a coupled state, at which the input disk (28) is coupled with the clutch disk (38) to rotate together.

波形垫圈（56）施加抵抗力，以抵抗离合器圆盘（38）从输 入圆盘（28）与离合器圆盘（38）连接以一起旋转的连接状态的轴向运 动。

youdao