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Coriolis effect???
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<blockquote data-quote="308stillbrass" data-source="post: 1716598" data-attributes="member: 109919"><p>In the northern hemisphere, northerly moving air is deflected to the east, and southerly moving air is deflected to the west. Because cyclones have a low pressure zone in their center, moving air (that would otherwise equalize that pressure) is at once deflected away from the center by the Coriolis force (keeping the low pressure zone low), and pulled toward it due to the fact that it is a low pressure zone. The Coriolis force also drives circular airflow around high pressure zones too (these are called anticyclones), but these weather systems are not as dramatic because the Coriolis force and the pressure gradient force don't oppose one another; they both work to dissipate the anticyclone. (you will want to check this out for yourself as I am not an expert in atmospheric physics) A Foucault pendulum is actually subject to the centrifugal force in addition to the Coriolis force, though the centrifugal force due to the spinning earth is rather small, and is easily accounted for by slightly adjusting the "constant" value of the acceleration due to gravity. The Coriolis force is exclusively responsible for changing the direction a Foucault pendulum swings in over time.</p></blockquote><p></p>
[QUOTE="308stillbrass, post: 1716598, member: 109919"] In the northern hemisphere, northerly moving air is deflected to the east, and southerly moving air is deflected to the west. Because cyclones have a low pressure zone in their center, moving air (that would otherwise equalize that pressure) is at once deflected away from the center by the Coriolis force (keeping the low pressure zone low), and pulled toward it due to the fact that it is a low pressure zone. The Coriolis force also drives circular airflow around high pressure zones too (these are called anticyclones), but these weather systems are not as dramatic because the Coriolis force and the pressure gradient force don't oppose one another; they both work to dissipate the anticyclone. (you will want to check this out for yourself as I am not an expert in atmospheric physics) A Foucault pendulum is actually subject to the centrifugal force in addition to the Coriolis force, though the centrifugal force due to the spinning earth is rather small, and is easily accounted for by slightly adjusting the "constant" value of the acceleration due to gravity. The Coriolis force is exclusively responsible for changing the direction a Foucault pendulum swings in over time. [/QUOTE]
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