The force that is a result of the Coriolis Effect always acts at 90 degrees to the right of the direction of the wind. The Coriolis force can be seen in Figure 3. The impact of the Coriolis force increases as the latitude increases.
This apparent force varies from zero directly over the Equator to its maximum value at the poles. The force of friction is a drag force. This force always acts to oppose the motion of an object, whether that object be a car or the wind. The frictional force is most prevalent at the surface and decreases as altitude increases. The force due to friction not only works to oppose the motion of any moving object, but it also has an impact on the amount an object is deflected by the Coriolis force.
This is because the Coriolis force not only depends on latitude, but also the speed of the object. When the frictional force reduces the speed of the moving object, it also decreases the impact of the Coriolis force. The ultimate impact of all three forces mentioned above can be seen in the demonstration at the bottom of this page. Figure 4: This figure shows the balance of the pressure gradient force and the Coriolis force. This balance is known as the geostrophic balance.
In a world without friction, the pressure gradient and Coriolis forces would exactly balance one another. This type of balance, called geostrophic balance by meteorologists, causes wind to move parallel to isobars.
Answer from: ebzloera. Geostrophic wind blows parallel to the isobars because the Coriolis force and pressure gradient force are in balance. However it should be realized that the actual wind is not always geostrophic. Especially near the surface. The surface of the Earth exerts a frictional drag on the air blowing just above it. Another question on Physics.
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In this case of a low pressure system or trough , the gradient wind blows parallel to the isobars at a less than geostrophic subgeostrophic speed. This also applies to high-pressure systems as well. In this case, again starting from point A, the geostrophic wind will blow straight south. This time the centrifugal force is pushing in the same direction as the pressure gradient force , and when it gets slightly further away from the center, the centrifugal force again reduces, but this time that makes the Coriolis Force more dominant and the air parcel will move back to its original radius -- again with the end result being wind blowing parallel to the isobars.
Since the pressure gradient force still doesn't change, the Coriolis force must again adjust to balance the forces.
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