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.
The citizens of Somerville are slightly less educated than the national average of 21.84% for the average city or town: 14.31% of adults in Somerville have a bachelor's degree or advanced degree The per capita income in Somerville in 2010 was $20,626, which is middle income relative to Texas, and lower middle income relative to the rest of the US. This equates to an annual income of $82,504 for a family of four.