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.
Welcome to our Town! Folsom, NM has a population of about 77. The Folsom area is one of the most beautiful and interesting in Northern New Mexico. The village is located in a valley by the Dry Cimarron River. Capulin Volcano, an extinct volcano and national park, is about 7 miles to the southwest.