Note that the gravitation force (weight) acting on the car is only The front of the car impacts 0.5 m (the deformation distance).į max = 1/2 (2000 kg) (16.7 m/s) 2 / (0.5 m) Example - Car CrashĪ car with a mass of 2000 kg drives with speed 60 km/h (16.7 m/s) before it crashes into a massive concrete wall. Note! - The deformation slow-down distance is very important and the key to limit the forces acting on passengers in a car crash. The deformation slow-down distance can be calculated as The average impact force can be calculated as In a car crash the dynamic energy is converted to work and equation 1 and 2 can be combined to In an impact where the object is not deformed - the work made by the impact force slowing down the moving object equals to the work done by a spring force - and can be expressed asį max = maximum force at the end of the deformation (N, lb f) When a crumple zone deforms in a car crash the average impact force is designed to be as constant as possible. S = deformation distance, crumple zone (m, ft) In an impact - like a car crash - the work made by the impact force slowing down an moving object over a distance by deforming the crumple zone can be expressed asį avg = average impact force during deformation (N, lb f) The dynamic kinetic energy of a moving object, like a falling ball or a driving car, can be expressed as
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