# Forces applied to occupants in car crash (important for assignment )

Forces applied to occupants in car crash (important for assignment!!)

Ok so i'm in grade 10 at school and for my physics assignment i'm comparing the forces applied on the vehicle (or occupants) in a collision, where one car has a crumple zone and the other one doesn't. If they were both travelling at 60km/h and ran into a wall, and one stopped in 0.1 seconds and the other stopped in 0.04 seconds, what are the forces in each crash? I tried using formula like F=gm and stuff but it doesn't seem to suit my equation, as i'm expecting there to be more force applied on the vehicle with a stopping distance of 0.04 seconds, because i'm giving a real life example of how crumple zones are safer than a car with no crumple zone. Sorry if this was hard to understand because it was badly worded but i've been working on this assignment for hours and i'm tired. The assignment is due in 3 days so quick replies will be much appreciated. Thank you to anyone who can help!

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CAF123
Gold Member

Ok so i'm in grade 10 at school and for my physics assignment i'm comparing the forces applied on the vehicle (or occupants) in a collision, where one car has a crumple zone and the other one doesn't. If they were both travelling at 60km/h and ran into a wall, and one stopped in 0.1 seconds and the other stopped in 0.04 seconds, what are the forces in each crash? I tried using formula like F=gm and stuff but it doesn't seem to suit my equation, as i'm expecting there to be more force applied on the vehicle with a stopping distance of 0.04 seconds, because i'm giving a real life example of how crumple zones are safer than a car with no crumple zone. Sorry if this was hard to understand because it was badly worded but i've been working on this assignment for hours and i'm tired. The assignment is due in 3 days so quick replies will be much appreciated. Thank you to anyone who can help!
Have you come across the concept of impulse and momentum?

CWatters
Homework Helper
Gold Member

You could assume uniform deceleration and apply the equation of motion..

http://en.wikipedia.org/wiki/Equations_of_motion

V= at +u

Rearrange to give an equation for "a".

Convert to F if you know the mass.