owners manual Seat Leon

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leon_EN.book Seite 21 Donnerstag, 15. April 2010 9:19 09 Seat belts 21 Why wear seat belts? Physical principles of frontal collisions In the event of a frontal collision, a large amount of kinetic energy must be absorbed. Fig. 7 The vehicle hits the wall: the occupants are not wearing seat belts It is easy to explain how the laws of physics work in the case of a head-on collision: When a vehicle starts moving ⇒ fig. 6, a certain amount of energy known as “kinetic energy” is produced in the vehicle and its occupants. Fig. 6 Vehicle about to hit The amount of “kinetic energy” depends on the speed of the vehicle and the a wall: the occupants are weight of the vehicle and its passengers. The higher the speed and the not wearing seat beltsgreater the weight, the more energy there is to be “released” 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 multi- plied by four. 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 of impact ⇒fig.7. Even at speeds of 30 km/h to 50 km/h, the forces acting on bodies in a colli- sion can easily exceed one tonne (1000 kg). At greater speed these forces are even higher. Passengers not wearing seat belts are not “attached” to the vehicle. In a frontal collision, they will move forward at the same speed their vehicle was Safety first Operating instructions Practical tips Technical data

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