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In page Coriolis force:

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When considering atmospheric or oceanic dynamics, the vertical velocity is small, and the vertical component of the Coriolis acceleration ( v e cos φ {\displaystyle v_{e}\cos \varphi } ) is small compared with the acceleration due to gravity (g, approximately 9.81 m/s2 (32.2 ft/s2) near Earth's surface). For such cases, only the horizontal (east and north) components matter.[citation needed] The restriction of the above to the horizontal plane is (setting vu = 0):[citation needed]