Fundamentally, momentum conservation is linked to invariance under space translations. See Noether's theorem. If you want to find a system that does not conserve momentum you should look for situations where space is not uniform, e.g. balls rolling on the surface of a bowl, a planetary system (when the dynamics of the sun is neglected), etc.
Socorro is a city in Socorro County in the U.S. state of New Mexico. It is in the Rio Grande Valley at an elevation of 4,579 feet (1,396 m). In 2012 the population was 8,906.
Estimated median household income in 2013: $30,911 (it was $24,087 in 2000) Estimated per capita income in 2013: $12,227 (it was $7,287 in 2000) Socorro city income, earnings, and wages data. Estimated median house or condo value in 2013: $79,073 (it was $48,700 in 2000)