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The Wigner rotation states that the successive action of two Lorentz boosts in arbitrary directions is equivalent to a single Lorentz boost followed by a spatial rotation. This article discusses the general case.

For the first-order small vibrations of a mechanical system near its stable equilibrium position, there exist normal modes equal in number to its degrees of freedom.

If the pressures on both sides of a smooth adiabatic piston are equal but the temperatures are unequal, energy will transfer from the higher-temperature gas to the lower-temperature gas through microscopic vibrations of the piston, even when all heat conduction is neglected.

Small-amplitude vibrations of an incompressible elastic rope in a gravitational field.

This article introduces the derivation process of the original form of Ampere’s Law and discusses its relationship with the modern form.