# Car Crumple Zones

A document that gives extensive help on car crumple zones, and why they are so effective at wgat they do. VERY helpful

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Crumple Zones
Crumple zones are a legal requirement normally for automobiles like
cars. Before Mercedes developed the crumple zone concept,
drivers had to be extremely careful because one crash could not
only cause lots of damage to the car but could nearly always kill the
driver.
A crumple zone is mainly located at the front of a car because the
majority of collisions are head on. In fact a recent study said that
65% of all crashes were headon, 25% were rear crashes and 5%
each for the left and right sides. Therefore in nearly every car, the
most controlled damage will go to the front of the car.
The purpose of a crumple zone is to absorb energy from a crash ass
well as to disperse the energy. An example of this is like imagining
the inside of a car containing the passengers is a "cocoon" and the
rest of the car absorbs the impact. However sometimes energy from
a crash does get to the inside of a car and if this happens then the
inside body has to have a large surface area to spread the energy to
its maximum. Also the inside bodies of cars have crumple zones in
case energy from a crash does reach the inside of a car to the
passengers.
Newton's first law of motion says that every object will continue
moving in a straight line if no forces are acting on it like air resistance
or gravity. When applied to a car, when a car crashes, the
passengers keep on moving forward at the speed the car was
moving before the crash, this is called inertia or momentum. If cars
didn't have crumple zones, then the inertia on the passengers would
be much greater but this is not the case. As I said earlier. Crumple
zones are

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If crumple zones did not exist, then people could break bones from
the impact because of the speed they will be travelling from
momentum. Therefore crumple zones are very important in not only
dispersing energy but also to protect lives.
A crumple zone is generally made out of materials which are strong
enough to withstand everyday wearandtear, but weak enough to
crumple in the case of a car crash.…read more

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A seatbelt is designed to stop a passenger moving through the
windscreen, and to also protect the passenger from the hard interior
of the car.
Seatbelts were invented in the early 19th century because many car
drivers were suffering fatal injuries due to no restraint on their body in

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An airbag is like an envelope which is deployed in the event of a
crash. An airbag is only deployed effectively if the passenger is
wearing a seat belt. The way the airbag is deployed is that sensors in
the front and back, and occasionally sides detect when a crash has
taken place, and after the crash has been detected they send a
signal for the airbags to be deployed.…read more

### Page 6

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This is the same graph as the one above but it is
showing how kinetic energy is dispersed in a crash with the aid of
seat belts. The diagram I have made is showing that seat belts have
a much faster time for reaction so they are much more effective, and
they disperse the kinetic energy faster than the crumple zones can
because they are nearer to the passenger and they can withhold a lot
of inertia from a crash.…read more

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Therefore I can safely say that an airbag is the safest
and most effective car safety technique used today based on the
data I have collected and analysis.…read more