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Which best describes the relationship between pressure and shear in producing drag?

  • A.Neither contributes, since drag arises from gravity
  • B.Both contribute, and their relative importance depends on the body
  • C.Only pressure contributes for any body at any speed
  • D.Only shear contributes for any body at any speed

Answer: B

Correct answer: Both contribute, and their relative importance depends on the body

A streamlined body at low angle of attack is dominated by skin friction; a bluff body such as a cylinder or a deployed undercarriage is dominated by the pressure difference between its front and its separated wake. The same two mechanisms operate in every case, and only their proportion changes.

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