MET4300_SWX_LEC9

# MET4300_SWX_LEC9 - MET 4300 Lecture 9 Forces &amp; Balanced...

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MET 4300 Lecture 9 Forces & Balanced Motions

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Why does air move? Pressure and Wind in the Atmosphere are Coupled
Newton’s Laws of Motion Govern the Wind 1. Every object in a state of uniform motion (or at rest) will remain in that state of motion (or rest) unless an external force is applied. 2. Force is equal to mass times acceleration. Acceleration and force are vectors.

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What Forces Act On the Wind? Fundamental forces: 1) Pressure Gradient Force (PGF) 2) Gravity 3) Friction, which always acts to slow moving objects Apparent forces: 1) Coriolis force results from Earth’s rotation 2) Centrifugal force: is usually combined with gravity PGF and Coriolis forces are most important…
Pressure Gradient Force PGF tries to squeeze air toward lower pressure Pressure difference can result from a difference in air density (more molecules), air temperature (more energy per collision), or both.

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Coriolis Force In a rotating reference frame, objects following straight paths appear to move in curved paths. This leads to the “Coriolis Force”
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## This note was uploaded on 02/18/2012 for the course MET 4300 taught by Professor Staff during the Spring '08 term at FIU.

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MET4300_SWX_LEC9 - MET 4300 Lecture 9 Forces &amp; Balanced...

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