Because of the resistive forces, because of the drag by the liquid, the object is going to get a velocity in this direction, so there's going to be a component of the resistive force opposing it.
因为阻力,因为液体中的阻力,物体的速度,是朝这个方向,所以会有,一个相反的阻力。
2
The drag force acts in the opposite direction to the path of the ball.
阻力方向与球的运行方向相反。
3
Drag onto the page. Drag round rotation handle to change arrow direction; yellow diamond to resize line ends.