owners manual Seat Leon

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22 Seat belts 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. 9 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. 8, a certain amount of energy ⇒  known as kinetic energy is produced in the vehicle and its occupants. The amount of kinetic energy depends on the speed of the vehicle and the Fig. 8 Vehicle about to hit a wall: the occupantsweight of the vehicle and its passengers. The higher the speed and the are not wearing seat greater the weight, the more energy there is to be released in an accident. belts 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. Because the vehicle occupants in our example are not restrained by seat belts, all of the occupants' kinetic energy has to be absorbed at the point of impact ⇒ Fig. 9. Even at speeds of 30 km/h to 50 km/h, the forces acting on bodies in a col- lision can easily exceed one tonne (1000 kg). At greater speed these forces are even higher. 

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