They absorb energy to reduce injuries.
Impact sensors
car because if you crash bus don't have airbags and also a bus can tip over in a crash so the answer is a car
A car with higher crash worthiness can better absorb and disperse energy during a collision, reducing the force felt by occupants. This helps minimize injuries by preventing excessive transfer of energy to the occupants. Features like crumple zones, airbags, and seat belts work together to protect passengers during a crash.
To reduce injuries resulting from an accident.
Crumple zone
No, you do not have to buy airbags for your car. The airbags will come automatically when you buy your car.
Sodium azide is used in airbags because it is a very fast-releasing gas-generating compound. When a car crash occurs, an electrical signal triggers the decomposition of sodium azide, producing nitrogen gas that quickly inflates the airbag to protect the occupants.
The force of the crash must be high enough for the crash sensors to inflate the airbags ( SRS )
Just as with car seat belts, there was auto producer reluctance about making airbags standards equipment on automobiles. The main complaint for safety measures were that they would hurt the consumer as the price of a new car would of course rise. The other factor with seat belts was that consumers, despite its clear safety benefits, were often not wearing them. Enough so that laws had to be passed to force drivers and passengers to wear them. Once the cost hurdle argument about airbags was done, there of course was no problem about "compliance" as the airbags were an automatic safety device. The installation of airbags has certainly reduced injuries and prevented many deaths when there is a car crash.
No , not unless you crash into something in front of you afterwards with enough force for the airbags to inflate
airbags are important because if you get in to a crash you can die without an airbag and its also used for cushion when it happens