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.
For population 25 years and over in Somerville: 1  High school or higher: 79.8%. 2  Bachelor's degree or higher: 21.9%. 3  Graduate or professional degree: 10.0 4 %. Unemployed: 10. 5 8%. Mean travel time to work (commute): 28.0 minutes.