yes airbags protect you in a car crash
Not necessarily. The airbags are designed to activate during any crash that exhibits enough force to trigger the mechanism. Even a small impact can activate the airbags. It certainly doesn't mean the car is unusable - the used airbags can be simply replaced at a garage.
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
No, you do not have to buy airbags for your car. The airbags will come automatically when you buy your car.
Airbags rely on a deceleration sensor to trigger the mechanism. Since the force wasn't coming from the front of the car - the sensor won't have triggered.
The force of the crash must be high enough for the crash sensors to inflate the airbags ( SRS )
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
They absorb energy to reduce injuries.
Yes, airbags can be removed and replaced.
airbags on the sides of the doors of the car.
Well if you get airbags your defeating the purpose of having a old car