If a car moves consistently at 80 kmh and it weighs at 600kg, is it not generating any force? since you know, a=0, am I stupid or is Newton ?
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Force describes an interaction between two or more objects. Any type of collision will involve one of the bodies either speeding up or slowing down.
You might be thinking of kinetic energy which can be described using mass and velocity.A moving car has kinetic energy.
When it hits something it applies force and experiences force in return. But the amount of force is dependent on how fast the kinetic energy is transferred. So if a car hits a brick wall the deceleration is very quick and there is a lot of force, destroying the car. But if the car hits a comically giant cushion the deceleration happens slowly and the force and therefore damage is less, even if the kinetic energy was the same. (This is why cars have airbags and crumple zones-they essentially act as cushions to slow the deceleration of the passengers).
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