Physics in the News
In
March 2011 the New York Times ran a story about the significance of rear facing
car seats. The article explained
that a study demonstrated that children under 2 are 75% less likely to survive
a serious accident if they are not facing backwards. The article gives the explanation that an infant’s head is
large in relation to the rest of the body meaning that the supporting bones are
not fully ready to stabilize the head.
While the straps will often protect the infant’s body, when a severe
impact occurs the baby’s head is likely to snap forward and cause acute
trauma. With a rear facing seat
the impact will be absorbed throughout the hard shell of the seat and the head
of the infant will be protected.
The
physics behind this research relates to the forces that will be pushed on the
baby during impact. A head on
collision with a baby facing forward will result in both extreme force being
pushed on the fragile body as well as a potentially lethal head snap. The baby will be the primary recipient
of all of the force. The hard
shell of the seat will not prevent the forces from being exerted on the
baby. With the seat facing the
rear of the car the hard shell will be able to absorb and take the brunt of the
force from the impact. The normal
force of the seat pushing on the baby will be able to prevent the potentially
severe head snap and the infant will suffer a less severe injury. Of course this would be reversed for a
car that is hit from the rear.
Source: http://www.nytimes.com/2011/03/22/health/policy/22carseat.html?_r=1
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