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What happens in our coastal example if we have all three forces at the same time? It's a bit more complicated, so I'll just show you the answer:
The friction force is opposite to the wind direction, and the coriolis force is at right angles to the wind direction. Together, at just the right wind speed and direction, the two forces together can exactly cancel the pressure gradient force and lead to a steady state, unchanging wind.
This wind direction is in between the wind directions you would get if you just had friction, or just had coriolis: partly toward lower pressure, and partly at an angle with low pressure to the left and high pressure to the right. On a surface pressure map, the winds would be crossing the isobars, spiraling inward toward low pressure centers and outward from high pressure centers. It's complicated, but any schoolkid could sketch the resulting pattern.
Take a look at this surface map, and see how well that pattern seems to hold. Does the wind generally blow at an angle to the isobars?
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