Compliance

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The compliance of an object is the inverse of its stiffness. The stiffness of an object is intuitively obvious, that is, how much force does it take for a given deformation. This is similar to the elastic modulus (that is, the Young's modulus) however, the distinction is that the stiffness is a property of an object itself whereas the Young's modulus is a property of a material. In general, the stiffness is written as <math>k=F/\Delta</math>