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1. Safety Instructions
1.2.2 Why Wear Seat Belts
Seat belt can reduce impact injury of the pas-
senger as much as possible by reducing pas-
senger's forward movement inertia when a
front collision of the car occurs.
Physical Principles of Frontal Im
-
pact
While driving, both the vehicle and the oc-
cupants have energy (kinetic energy) which
depends on the vehicle speed and the occu-
pants’ mass. The larger the vehicle speed and
the mass, the more the energy upon impact.
In which, the vehicle speed is decisive. For ex-
ample, the released kinetic energy at 50km/h is
5 times that at 25 km/h.
OMA28-0157
During a crash, the occupants not wearing
the seat belts still move forward at the speed
before the crash due to inertia, but the vehicle
dose not. As a result, the occupants can be in-
jured seriously.
A28
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