Why solids spring back, liquids bead up and honey pours slowly.
Interatomic forces, bonds and the states of matter; elasticity, stress, strain, Hooke's law and the elastic moduli; stress–strain curves; elastic energy and measuring Young's modulus; surface tension, surface energy, excess pressure and capillarity; viscosity, Poiseuille's equation, Stokes' law, terminal velocity and the Reynolds number.