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):
or more gentle, as in normal braking:
Either way, the area under the curve is the same, since the velocity we must lose is the same.
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