Momentum

• Momentum: product of mass and velocity. $p\ =$$\ mv$
• Principle of conservation of linear momentum: when bodies in a system interact, total momentum remains constant provided no external force acts on the system $m_Au_{A\ +\ }m_Bu_{B\ =\ }m_Av_{A\ +\ }m_Bv_B$
• Impulse: product of force and time for which it acts $Ft\ =$$\ mv\ -\ mu$