Changes

Kinetic energy is actual visible energy, that is, energy of things that are in motion.  (Or light or other electromagnetic radiation; this is the motion of photons.  Light conveys both energy ad momentum.)

Kinetic energy is actual visible energy, that is, energy of things that are in motion.  (Or light or other electromagnetic radiation; this is the motion of photons.  Light conveys both energy ad momentum.)

Potential energy is "hidden" energy that can become kinetic energy, or vice-versa.  A wound up spring, a charged battery, a stretched rubber band, a mixture of gasoline and air, an explosive, and a radioactive atom all have potential energy.

Potential energy is "hidden" energy that can become kinetic energy, or vice-versa.  A wound up spring, a charged battery, a stretched rubber band, a mixture of gasoline and air, an explosive, and a radioactive atom, all have potential energy.

The principle of ''conservation of energy'', universally accepted for well over 100 years, says

The principle of ''conservation of energy'', universally accepted for well over 100 years, says