Short answer
Kinetic energy is energy of motion. Potential energy is energy associated with a system’s position or configuration, such as a lifted object in Earth’s gravity or a compressed spring. A falling object can lose gravitational potential energy while gaining kinetic energy. 1 2
Kinetic energy describes motion; potential energy tracks how a system is arranged. They can transform into one another.
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At a glance
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| Question | Kinetic energy | Potential energy |
|---|---|---|
| Main basis | Motion | Position or configuration |
| Simple example | Moving ball | Raised ball–Earth system |
| Zero point | At rest in chosen frame | Chosen reference level matters |
The table summarizes the cited definitions and the article’s stated scope. 1 2
What each thing is
Kinetic energy. Energy associated with motion, in simple translational mechanics proportional to mass and speed squared. 1
Potential energy. Energy associated with the position or configuration of a system in a conservative interaction. 2
Key differences
For a moving object in elementary mechanics, translational kinetic energy is ½mv². Near Earth’s surface, a change in gravitational potential energy is approximately mgΔh. The latter belongs to an interacting system, not a magical reservoir inside the object alone. 1 2
How to tell them apart
Ask whether energy is being attributed to present motion or to how a system is arranged. A ball at the top of a shelf can have gravitational potential energy while stationary; the same ball in flight has kinetic energy. 1 2
Where they overlap
A system can have both at once. With negligible losses, changes in one form can balance changes in the other; friction can send some mechanical energy into thermal energy. 1 2
Edge cases
Kinetic energy depends on the reference frame used to measure velocity. The zero of potential energy is conventional; differences are what matter. Potential energy also exists in electrical and elastic systems. 1 2
Why the distinction exists
The distinction tracks energy transfers and makes motion under forces predictable. 1 2
Common misconceptions
Potential energy does not mean “energy that is unreal until used.” It is a valid property of a configured system. 1 2
Examples
A compressed spring has elastic potential energy. After release, a propelled toy gains kinetic energy. 1 2
Sources
Sources checked October 3, 2026.
- OpenStax — Kinetic Energy and the Work-Energy Theorem. Kinetic energy.
- OpenStax — Gravitational Potential Energy. Gravitational potential energy.