First slide
Stress and strain

A block of gelatin is 60 mm by 60 mm by 20 mm when unstressed. A force of 0.245N is applied tangentially to the upper surface , causing a 5 mm displacement relative to the lower surface. Following observations are made regarding the block.
(i) the shearing stress developed on the surface is 68.1 Pa
(ii) the shearing strain developed on surface is 0.25 Pa
(iii) the shear modulus of material is 272.4  N/m2
Regarding above statements we can say



Shear modulus=  S=FAtanθ=68.40.25=272.4N/m2

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