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 2020 Census will be interesting to watch, as it is possible that the Massachusetts population will have crept over the seven million mark. However, experts project that the population at the next Census will remain around 6.7 million, while 2030 may see a population of 6.8 million. Population Data via US Census.