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, Texas. Somerville (/ËsÊmÉrvÉªl/ SUM-er-vill) is a city in Burleson County, Texas, United States. The population was 1,376 at the 2010 census. Somerville is 90 miles (140 km) north of Houston. Somerville is named for Albert Somerville the first president of the Gulf, Colorado and Santa Fe Railway.