Impulse/Momentum

http://www.youtube.com/watch?v=fQ-xOplVUyc

This video show the importance of an air bag, and what happens when someone crashes and the airbags are used. This video posees the question: why are air bags important?

p=mv, change in P=pfinial-pintial--the car will go from moving to not moving no matter how it is stopped. Therefore the change in momentum is the same regardless of how you have stopped.

J=change in P--Since the change in momentum is the same no matter what you hit, the impulse is also the same.

J=F(delta)t--Since J is the same no matter what you hit the airbag increases the time and thus the force must be samller, smaller force=less injury