Physics · Class 11
5 free physics experiments and lesson notes for Mechanical Properties of Solids, with model limits, worked examples and Tamil explanations.
Stress is force per area; strain is extension divided by original length. Within the linear elastic region the stress-strain slope is Young modulus. Releasing the load recovers the original length in this model.
Run this experiment →A long thin wire stretches more than a short thick wire under the same load. Modulus describes the material; the wire stiffness also depends on its dimensions.
Run this experiment →Bulk modulus describes resistance to volume change under uniform pressure. Shear modulus describes resistance to shape change under tangential stress. A negative volume strain indicates compression.
Run this experiment →An ordinary stretched wire contracts sideways. Poisson ratio compares this negative lateral strain with the positive longitudinal strain. At small strain, the volume change is approximately (1−2ν)ε.
Run this experiment →The force rises from zero as a wire extends or a beam bends, so stored work is half final force times deflection. Beam geometry enters through its cross-section second moment: greater depth sharply reduces bending.
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