Conservation of momentum means that the momentum of a rigid body interacting with another rigid body will be the same on both sides of the equation. Refer to equation 1 for the conservation of linear moment, and equation 2 for the conservation of angular momentum.

**(Eq 1)** $mv_1=mv_2$

m = mass

v_{1} = Initial velocity

v_{2} = Final velocity

**(Eq 2)** $Iϖ_1=Iϖ_2$

I = Moment of Inertia

ϖ_{1} = Initial anglular velocity

ϖ_{2} = Final anglular velocity