Crumple zones are less rigid structures at the front and back of the car. They are crushed in impact, so that the force is not transferred directly to the ocupents (who are protected in a rigid steel cage.
Seat belts and air bags bring the driver gradually to rest, avoiding a sudden sharp impact with the windscreen or dashboard. The release or an air bag is triggered by an accelerometer, a tiny elctronic device that responds to the vehicle's sudden, large deacceleration in impact. An explosive charge is set off, exploding the bag outwards towards the driver.
Controlling impact forces
These safety features ensure that the occupants of the car are brought slowly to a halt. This increases the time taken to stop, leading to a smaller deacceleration. According to F=ma, this means that the impact force is reduced. A sudden stop which happens in shorter time results in bigger and more damaging impact forces
Comments
No comments have yet been made