kinetic energy

energy produced by motion

The kinetic energy of an object is the extra energy which it possesses due to its motion. It is defined as the work needed to accelerate a body of a given mass from rest to its current velocity. Having gained this energy during its acceleration, the body maintains this kinetic energy unless its speed changes. Negative work of the same magnitude would be required to return the body to a state of rest from that velocity.
See more at Wikipedia.org...

Kinetic energy n. The energy possessed by a body because of its motion, equal to one half the mass of the body times the square of its speed. [more]Kinetic energy - Community and Resources

Noun
1. the mechanical energy that a body has by virtue of its motion
(synonym) K.E.
(hypernym) mechanical energy

Energy possessed by a moving object or water body.