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