Define; (i) Elasticity (ii) Young's modulus (iii) Force constant
Question 1 Report
Define;
(i) Elasticity
(ii) Young's modulus
(iii) Force constant
Answer Details
(i) Elasticity
Elasticity is the property of a material by which it returns to its original size and shape after the deforming force applied to it has been removed.
(ii) Young's modulus
Young's modulus (the modulus of elasticity) is the ratio of the tensile stress to the tensile strain of a material, provided the elastic limit is not exceeded: \[ E = \frac{\text{stress}}{\text{strain}} = \frac{F/A}{e/L} = \frac{FL}{Ae} \] Its S.I. unit is the pascal (N m-2).
(iii) Force constant
The force constant (stiffness) of an elastic material is the force required to produce unit extension in it: \[ k = \frac{F}{e} \] Its S.I. unit is newton per metre (N m-1).
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