Skin friction on the fuselage is what type of drag?

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Multiple Choice

Skin friction on the fuselage is what type of drag?

Explanation:
Skin friction drag comes from the viscous shear of air as it flows along the fuselage surface. This is a viscous component of drag that exists regardless of lift and grows with speed, which places it in the parasite drag category. Parasite drag also includes form (pressure) drag, but skin friction specifically is the shear-based portion, not the pressure-based portion. Induced drag, in contrast, is produced by lift and the accompanying wingtip vortices, not by surface shear. So the skin friction on the fuselage is parasite drag.

Skin friction drag comes from the viscous shear of air as it flows along the fuselage surface. This is a viscous component of drag that exists regardless of lift and grows with speed, which places it in the parasite drag category. Parasite drag also includes form (pressure) drag, but skin friction specifically is the shear-based portion, not the pressure-based portion. Induced drag, in contrast, is produced by lift and the accompanying wingtip vortices, not by surface shear. So the skin friction on the fuselage is parasite drag.

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