Discussion
Stiffness of a structure in the context of vibration is
Answer: A
Correct answer: the force required to produce unit displacement
Stiffness is force per unit displacement, in newtons per metre, and it is the property multiplying \( u \) in the equation of motion.
Its reciprocal is flexibility, the displacement produced by unit force, which is what the second option describes. Mass per unit length is a quite different property, and energy dissipated per cycle is a measure of damping. Stiffness and mass together fix the natural frequency as \( \sqrt{k/m} \).
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