What happens when kinetic energy decreases?
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Answer:
One of the most fundamental concepts in physics is energy. It's difficult to define what energy actually is, but one useful definition might be "a measure of the amount of change taking place within a system, or the potential for change to take place within the system".
Roughly speaking, energy can be divided into two forms, kinetic and potential. Kinetic energy is the energy of movement or change. Potential energy is the energy a system has as a result of being able to undergo some change. To provide a specific example, a falling book has kinetic energy, because its position in space is changing (it is moving downwards). A book resting on a shelf has no potential energy relative to the shelf since it has a height of zero meters relative to the shelf. However, if the book is elevated to some height above the shelf, then it has potential energy proportional to the height at which it resides above the shelf.