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The two sources of the aerodynamic force on a body are

  • A.The weight of the air displaced and the temperature of the surface
  • B.Electrostatic attraction and the magnetic field of the earth
  • C.Pressure acting normal to the surface and shear stress acting tangentially
  • D.Gravity acting on the body and the thrust of its engines

Answer: C

Every aerodynamic force and moment, without exception, arises from the pressure distribution acting perpendicular to the surface and the shear stress distribution acting along it. Integrating those two over the whole surface gives the resultant force and moment.

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