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.
Situated on the northeastern edge of the country, this tiny territory contains the town of Plymouth, home to the Pilgrim colony of 1620, and as one of the first settled states, the population statistics have always been healthy. As of 2016, Massachusetts' population stands at 6,794,422. Moving forward to the present day, the Massachusetts population in 2016 has risen beyond the 6.7 million mark and it is the 3rd most densely populated area in the United States, despite being the 7th smallest state in the country.