| Frictional Force |
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| q | A force of opposition which slows air in motion. |
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| q | Initiated at the surface and extend, decreasingly, aloft. |
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| q | Important for air within 1.5 km (1 mi) of the surface, the |
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| planetary boundary layer. |
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| q | Because friction reduces wind speed it also reduces |
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| Coriolis deflection. |
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| q | Friction above 1.5 km is negligible. |
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| q | Above 1.5 km = the free atmosphere. |
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