Linear momentum

The linear momentum (symbol p) of an object is its velocity multiplied by its mass. The SI unit for momentum is kg·m/s or N·s. In a closed system, total linear momentum is conserved. This can be observed in many scenarios, such as elastic collisions, where linear momentum is conserved save for a tiny amount lost to friction.
Momentum is equal to the integral of force with respect to time, or
:p = \int^b_a F(t) dt
Category:Mechanics