The colored portion of the eye. The form of energy that an object has because of its motion. The amount of kinetic energy an object has depends on its mass as well as its velocity. The more massive an object is and the faster it is going, the more kinetic energy it has. The total kinetic energy of a system is the sum of the kinetic energy of each of the objects or particles in the system.
Energy is required when a solid melts, a liquid evaporates, or when a solid vaporizes.
For example, water vapor contains latent heat. When a material goes from a vapor to a liquid or from a liquid to a solid, energy is released. So when water vapor condenses to water, the latent heat originally required to evaporate the water is released. See also heat energy . M matter Matter is the term used to describe the substance of which all living and non-living things are made.