Seat belts
The effects of the laws of physics in the case
of a head-on collision ar e easy t
o e
xplain: 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
