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# Thread: physics question?

1. ## physics question?

An airbag inflates when a collision occurs, which protects the passenger inside. Why does the airbag soften the blow. Discuss the physics involved in this...

I think its because the air bag slows down the persons acceleration..?

2. Originally Posted by Jenseno9
An airbag inflates when a collision occurs, which protects the passenger inside. Why does the airbag soften the blow. Discuss the physics involved in this...

I think its because the air bag slows down the persons acceleration..?
Law of conservation of momentum.. m1v1 + m2v2 = m1v1' + m2v2' energy is transfered, never lost. You have the idea, the airbag is going to reduce the velocity of the persons mellon. To actually figure out by how much you would need more info.

[mass(velocity) before collsion] equals [mass(velocity) after collision]
m1v1 + m2v2 = m1v1' + m2v2'
velocity is a vector, change the sign on either force to represent direction cause they are comiing at eachother.
Last edited by monster.; 04-07-2005 at 11:04 PM.

3. thanks we went over this like 2 weeks ago and i had kinda forgot about it...

4. palme or johan i think its johan knows his **** when it comes to physics too, he's on the other side of the world right now though..

5. how bout this one..
why does an astronaut in a spacecraft orbiting Earth experience a feeling of weightlessness?

Fg= G(m1m2/r2)

maybe cause the radius is larger?