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.
Estimated figures were released in July 2015, claiming that the Massachusetts population has risen to 6,794,422, making this the 14th most populous state in the US. Massachusetts Population Projections. Looking at population growth throughout the 20th century, there is an indication that rises within Massachusetts are slowing down.