> [!summary] Conservation of momentum is a special case where the net impulse is zero. > **Key Equations:** > Conservation of Momentum: $\Delta p=0$ >[!info]+ Read Time **⏱ 1 min** # Definition The conservation of momentum is a special case when the net [[Impulse|impulse]] is zero. This implies that no [[Newton Laws|external forces]] are acting on a body or a system. From the [[Impulse-Momentum Theorem|impulse momentum theorem]], because the net impulse is zero, the [[Linear Momentum|change in momentum]] is zero as well. $ \text{If $I=0$} \Rightarrow \Delta p =0 $