There are a couple of things to think about
with your question.
1. People who don't wear seat belts are
much more likely to be ejected from their seats
in a car crash! This is because as the car is
moving, it has a certain amount of inertia, or
tendency to remain in motion. When the car stops
suddenly, a passenger's body will tend to keep
moving forward, because of inertia. If the
passenger is not wearing a seatbelt, he or she
could hit the dashboard or even be ejected
through the front windshield.
2. Another thing to keep in mind is that
seatbelts are "stretchy." When a car suddenly
stops, the seatbelt increases the time over
which the passenger's body comes to a stop. This
in turn decreases the force the passenger feels
when the car stops, and decreasing the chance of
Moral of the story, wear your seat belt! :)
The concept is the rate at which passenger's
body changes speed, and thus the amount of force
that the passenger's body is subjected to. The
shorter the time over which the passenger is
forced to stop moving, the more force is applied
to his body to make him stop. Apply enough
force, and it causes damage.
Wearing a seatbelt slows down the passenger's
motion by causing the passenger to start slowing
down before he or she is thrown into the
dashboard when the car suddenly stops. This
means that the passenger has more time in which
to stop moving, and thus is less likely to break
bones or suffer other physical injury.
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