Head Injury Criterion - Normal Breaking

Normal braking in a street car: 10 ms-2 (or about 1 g).

Normal braking in a racing car: 50 ms-2 (or about 5 g). This is due to aerodynamic styling and large tyres with special rubber.

When we stop in a car, the deceleration can be either abrupt (as in a crash):

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or more gentle, as in normal braking:

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Either way, the area under the curve is the same, since the velocity we must lose is the same.



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