Physics: Why Water in Car Acceleration is Perpendicular

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When a car accelerates, the surface of the water in a container aligns perpendicular to the net force, which includes both gravity and the fictitious force due to acceleration. This occurs because the water experiences different forces depending on the frame of reference; inside the car, the fictitious force is perceived, while outside, the normal force and gravitational force are relevant. The net force acting on the water remains constant, but the perception of forces changes based on the observer's position. The water's surface reflects the balance of these forces, illustrating the effects of acceleration in a non-inertial frame. Understanding this concept clarifies why the water's surface behaves as it does during acceleration.
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if water in a container in a car and the car accelerates why the surface of the water is perpendicular to the net force of gravity and fictitious force not to the net of normal and gravitational force?
 
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It's the same net force on the water, the only difference is the frame of reference, such as inside the car (fictitious force, no apparent normal acceleration), versus the ground outside the car (force related to normal acceleration of water).
 
you don't get what i mean
imagine the surface of the water
it will be perpendicular to net force of gravity and fictitious force
while the normal force is the actual acting force
 

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