Perfectly elastic collisions are those in which no kinetic energy is lost in the collision. Macroscopic collisions are generally inelastic and do not conserve kinetic energy, though of course the total energy is conserved as required by the general principle of conservation of energy.
Ector, Texas. Not to be confused with Ector County, Texas. Ector is a city in Fannin County, Texas, United States. The population was 695 at the 2010 census, up from 600 at the 2000 census.
Frio County is a county located in the U.S. state of Texas. As of the 2010 census, its population was 17,217. The county seat is Pearsall. The county was created in 1858 and later organized in 1871. Frio is named for the Frio River, whose name is Spanish for cold.