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.
Somerville has access to Sr 67, which runs through the Southern part of town. Named for an an officer killed in 1814 during the Creek Indian War; this city is really small with a population under 500 residing in an area just over one square mile in size. It is part of the Decatur Metropolitan area and is close enough to the other towns in the area to enjoy many opportunities for recreation.