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.
Socorro County, New Mexico. Socorro County is a county in the U.S. state of New Mexico. As of the 2010 census, the population was 17,866. The county seat is Socorro. The county was formed in 1852 as one of the original nine counties of New Mexico Territory. Socorro was originally the name given to a Native American village (see: Puebloan peoples) by Don Juan de OÃ±ate in 1598.