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For small deformations, stress is proportional to strain.
Longitudinal elasticity — how much a wire stretches under load.
How much volume shrinks under pressure (B), or shape shifts under shear (η).
Liquid surface acts like a stretched membrane — drives capillary rise.
Falling sphere reaches a constant terminal velocity due to viscous drag.
In flowing fluid, higher speed means lower pressure — energy conservation.
Submerged body experiences upward force equal to weight of displaced fluid.