Which drag is defined as the frictional resistance along the wing surface?

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Multiple Choice

Which drag is defined as the frictional resistance along the wing surface?

Explanation:
The frictional resistance along the wing surface is the viscous shear of the boundary layer, known as skin friction drag. This is a component of parasite drag—the portion of drag not related to lifting force. Parasite drag also includes form (pressure) drag from the wing’s shape, but the specific idea of friction along the surface points to parasite drag as the correct overall category. Induced drag comes from the generation of lift (wingtip vortices) and is not about surface friction, while form drag is about pressure distribution rather than the friction on the surface.

The frictional resistance along the wing surface is the viscous shear of the boundary layer, known as skin friction drag. This is a component of parasite drag—the portion of drag not related to lifting force. Parasite drag also includes form (pressure) drag from the wing’s shape, but the specific idea of friction along the surface points to parasite drag as the correct overall category. Induced drag comes from the generation of lift (wingtip vortices) and is not about surface friction, while form drag is about pressure distribution rather than the friction on the surface.

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