Sahil Khan
1

Ari bags are needed to keep occupants from harm and to cushion the blow of impact. A moving car has inertia and so do the occupants driving it. In a collision, seat belts alone are sometimes not enough to stop the motion of drivers or passengers. Air bags further cushion people from the effects of inertia in an accident

Timing is crucial in the airbag's ability to save lives in a head-on collision. An airbag must be able to deploy in a matter of milliseconds from the initial collision impact. It must also be prevented from deploying when there is no collision.


Read this to understand how air bags work.

http://www.chemistry.wustl.edu/~edudev/LabTutorials/Airbags/airbags.html