Sign up ×
Physics Stack Exchange is a question and answer site for active researchers, academics and students of physics. It's 100% free.

The problem:

In a car crash, a passenger with a mass of 82kg is not wearing a seatbelt. The car is travelling at 45km per hour. What impulse must the car's airbag provide in order to stop the passenger's motion?

Explain why hitting an airbag will cause less injury than if a passenger hits the dashboard.

Here is what I did:

I thought impulse meaning force, so to find force I can use $F = m\Delta v/\Delta t$. But I don't know what $t$ is. How can I find $t$?

share|cite|improve this question

1 Answer 1

up vote 2 down vote accepted

Impulse is the product of the force and the time over which it is applied, and tells you the total change in momentum: $$I = F\Delta t = \Delta p$$.

share|cite|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.