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Reference.org
Stiffness
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<p>Stiffness is the extent to which an object resists <a href="/facts/Deformation_(mechanics)/xK7R59oI">deformation</a> in response to an applied <a href="/facts/Force/533Q1uzq">force</a>. </p><p>The complementary concept is flexibility or pliability: the more flexible an object is, the less stiff it is. </p>