<Dd> p = m v cm . (\ displaystyle p = mv_ (\ text (cm)).) </Dd> <P> This is known as Euler's first law . </P> <P> If a force F is applied to a particle for a time interval Δt, the momentum of the particle changes by an amount </P> <Dl> <Dd> Δ p = F Δ t . (\ displaystyle \ Delta p = F \ Delta t \, .) </Dd> </Dl>

Mathematical expression of the law of conservation of momentum