Does all physical change involve energy?

No. A circular orbit, for example, changes continuously with no change in energy. For that matter, conservation of momentum means an object in motion stays in motion with no change of energy. read more

Energy may be released or absorbed when a substance changes from one physical state to another. In a chemical change, a chemical reaction yields a completely new substance. A substance's particles are changed during a chemical reaction. read more

All changes in matter involve changes in energy. Energy is either released or absorbed. The energy is often in the form of heat, but it also may be in the form of sound or light. read more

One difficulty in answering this question lies in the nebulous phrases "change state" and "involve energy." An object cannot change its position (even in straight-line motion) unless it has some kinetic energy. If no forces do work (as in the case of uniform or uniform circular motion) then there is no change in energy, but it is hard to see how a classical particle with zero potential and zero kinetic energy can change position. read more