Why Wear Seat Belts - Seat ALHAMBRA Owner's Manual

Why wear seat belts?

Frontal collisions and the laws of physics
Safety First
Fig. 5 Vehicle about to
hit a wall: the occupants
are not wearing seat
belts.
Fig. 6 The vehicle hits
the wall: the occupants
are not wearing seat
belts.
Operating instructions
It is easy to explain how the laws of physics work in the case of a head-on
collision: when a vehicle starts moving
energy known as kinetic energy both in the vehicle and in the occupants.
The higher the speed and the greater the weight of the vehicle, the more
energy there is to be absorbed in an accident.
The most significant factor, however, is the speed of the vehicle. If the
speed doubles from 25 km/h to 50 km/h, for example, the kinetic energy is
multiplied by four.
The amount of kinetic energy depends on the speed of the vehicle and the
weight of the vehicle and its passengers. The higher the speed and the
greater the weight of the vehicle and the occupants, the more energy there
is to be absorbed in an accident.
Passengers not wearing seat belts are not "attached" to the vehicle. As a
result, in a frontal collision they will continue to move forward at the speed
their vehicle was travelling just before the impact until something stops
them! Because the passengers in our example are not restrained by seat
belts, all of the passengers' kinetic energy has to be absorbed at the point
⇒ f ig.
of impact 6.
At speeds of 30 km/h to 50 km/h, the forces acting on bodies in a collision
can easily exceed one tonne (1000 kg). At greater speed these forces are
even higher.
This example applies not only to head-on collisions, but to all accidents and
collisions.
Practical tips
Seat belts
⇒ f ig.
5, this is a certain amount of
Technical Specifications
19
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