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 is mentioned 1,369 times on our forum: Latest news from Socorro, NM collected exclusively by city-data.com from local newspapers, TV, and radio stations. Ancestries: United States (9.2%), German (5.5%), English (3.2%), Irish (2.7%), Italian (2.1%), French (1.7%). Current Local Time: MST time zone. Elevation: 4605 feet.