Momentum is not conserved if there is friction, gravity, or net force (net force just means the total amount of force). What it means is that if you act on an object, its momentum will change. This should be obvious, since you are adding to or taking away from the object's velocity and therefore changing its momentum.
Somerville, Massachusetts. Somerville (/ËsÊmÉrvÉªl/ SUM-Ér-vil) is a city located directly to the northwest of Boston, in Middlesex County, Massachusetts, United States. As of 2010, the United States Census has the city with a total population of 75,754 people, and is the most densely populated municipality in New England.
Contents: Cities, Towns & Places. The population of all cities, towns and unincorporated places in Massachusetts with more than 15,000 inhabitants according to census results and latest official estimates. 2000 population of incorporated places like cities and towns in the boundaries of 2010. 2010 and 2016 population of incorporated places in the boundaries of 2016. No older population figures will be presented in case of significant boundary changes. (1990) (2000) (2010) (2016) U.S. Census Bureau (web)