Seat Mii 2020 Owner's Manual page 18

Never use seat belt clips, fastening rings
●
or similar items to alter the position of the
belt webbing.
Frayed or torn seat belts or damage to
●
the connections, belt retractors or parts of
the buckle could cause severe injuries in
the event of an accident. Therefore, you
must check the condition of all seat belts
at regular intervals.
Seat belts which have been worn in an
●
accident and have been stretched must be
replaced by a specialised workshop. Re-
newal may be necessary even if there is no
apparent damage. The belt anchorage
should also be checked.
Do not attempt to repair a damaged seat
●
belt yourself. The seat belts must not be re-
moved or modified in any way.
The belts must be kept clean, otherwise
●
the retractors may not work properly.
16
Safety
Head-on collisions and the laws of
physics
A driver not wearing a seat belt is thrown
Fig. 7
forward violently.
The unbelted passenger in the rear seat
Fig. 8
is thrown forward violently, hitting the driver
who is wearing a seat belt.
The effects of the laws of physics in the case
of a head-on collision are easy to explain: the
moment a vehicle starts moving, a type of en-
ergy called "kinetic energy" starts acting on
both the vehicle and its passengers.
The amount of "kinetic energy" depends on
the speed of the vehicle and on the weight of
the vehicle and of its passengers. The higher
they are, the more energy there is to be "ab-
sorbed" in the event of an accident.
The most significant factor, however, is the
speed of the vehicle. If the speed doubles
from 25 km/h (15 mph) to 50 km/h (30 mph),
for example, the corresponding kinetic ener-
gy is multiplied by four.
Given that the passengers of the vehicle in
our example do not have their seat belts fas-
tened, in the event of a collision the entire
amount of the passengers' kinetic energy will
be only absorbed by the mentioned impact.
Even at speeds of 30 km/h (19 mph) to
50 km/h (30 mph), the forces acting on bod-
ies in a collision can easily exceed one tonne
(1000 kg). At greater speed these forces are
even higher.
Vehicle occupants not wearing seat belts are
not "attached" to the vehicle. In a head-on
collision, they will move forward at the same
speed their vehicle was travelling just before
the impact. This example applies not only to
head-on collisions, but to all accidents and
collisions.
Even at low speeds the forces acting on the
body in a collision are so great that it is not