The formula for linear momentum is $\mathbf{p} = m\mathbf{v}$, where $m$ is mass and $\mathbf{v}$ is velocity.
Linear momentum is conserved in isolated systems with no external forces.
The unit of linear momentum in the International System (SI) is kilogram meter per second (kg·m/s).
Impulse, defined as the change in momentum, equals the force applied multiplied by the time interval over which it acts: $\mathbf{J} = \Delta \mathbf{p} = \mathbf{F}\Delta t$.
In collisions, whether elastic or inelastic, total linear momentum before and after the collision remains constant.
Review Questions
What is the formula for calculating linear momentum?
How does linear momentum behave in an isolated system with no external forces?
Impulse is the change in an object's momentum due to a force applied over a period of time. It can be calculated using $\mathbf{J} = \Delta \mathbf{p} = \mathbf{F}\Delta t$.