Closely related to momentum is impulse (denoted by J), which is simply the initial momentum subtracted from the final momentum.
The idea of impulse is important in things like mechanical engineering in which objects crash into each other.
The late scientist Harold Edgerton was able to further examine impulse and show how bodies interact when they crash at high speeds by using his strobe light.
Things such as baseballs being hits by bats and bullets going through playing cards could then be analyzed.
Impulse has more important consequences in car safety and the force of impact can be found by knowing the impulse through the equation F=J/Δt.