An airbag inflates when collision occurs. Why does the airbag soften the blow? Discuss the physics involved?

Answer 1

As the head strikes the bag, it forces air out the vents at the back which allows for the head to sink into the pillow of air and reduce the decelerationat which the person comes to a stop. As force = mass*acceleration, then the force on the head is lower than it would be if the airbag remained inflated, or if there were no airbag at all.

Answer 2

Lets now see what happens when a body collides with another body. The impact created on both bodies is as a resault of the force generated by both bodies multuplied by the duration of the impact.

when it comes to impact issues the end resault of two bodies colliding. differes with the bodies mass and density. you see the way you will feel hitting a wall with your bare hand will differ with the way you will feel when hitting a big baloon.

Well when two hard bodies collide the weaker body suffers more dammage as a resault of the energy collected by both bodies during their brief momentum. the simplest module of this is explained in the formular of impact which is
impact=force*time

the resaultant force will be as a resault of both bodies forces in which added together will create much energy. So lets get to the point where the real energy issues apply inconcern to the head and the infatable air bag.

see if you hit you head on the steering wheel(I dont say you do) you will probably break your nose or even worse crush your skull. this is because the head tissue is more delicate than the wheel material thus it is your head that will absorb most of the energy causing tension then resaulting to a fructured skull.

When it comes to the air bag (Thank God for who invented it). the two objects will create an impact but due to the ELASTICITY of the air bag and also Mallability(if theres any word like that for mallable) the energy created by the impact created by the collision of both your head and the air bag is greatly consumed and distributed to the air molecues in the air bag(since your head molecues are in fixed positions and in the airbag they are free to roam.) leaving you head with less enegy created thus you dont feel that impact created.
hope this answers you.

Answer 3

OK when collision occurs a tablet is dropped in water which causes a chemical reaction and the air bag fills up with gas..it has lots of holes in it so the bag can deflate so as you hit it you push out the gas but at a controlled rate so you have a much slower velocity than if you had no airbag.

Another reason to make airbag deflate quickly is to get it out of your face so you can see in case still moving

Answer 4

The airbag deploys and spreads the force of deceleration over a higher area of your body. Rather than transfering the force of decelaration to 1 sq in with 5000 pounds (5000 psi or enough to break your skull) the 5000 pounds which is still going to be used to decelerate your head is spread over 5 or 6 square inches to reduce the effect on your head to less than 1000 psi. This difference saves your skull. Hopefully your brain didn't slosh about and kill you.

Answer 5

The air bag acts as a critically damped spring, damping out the impact of the body hitting the bag. In this way it provides a reduced total decellartion force against the body over a longer time period to cause it to come to a rest, compared to the windscreen which would provide a very high instantaneous force,

Answer 6

Yeh,
Air bag distributes the force of impact over larger area of ur face/head therby reducing the damage.

at the same time the impact is transferred to the air inside the bag which has ability to expand/contract therby absorbing the impact force..

try this------- take a hammer and hit on a wooden surface with it. it will create a damage mark if not break it all together. now repeat the experiment with an air pillow. put air pillow on table and try to hit table through pillow (pillow between table and hammer) all the impact is brone by the pillow and the table is unscratched.

Answer 7

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Answer 8

Two main reasons:

1. spreads impact over a large area
2. gases are compressible, so soak up the shock

Answer 9

balloon go BOOM head hit balloon =person alive:)