When a force acts on an object that is able to move or moving its momentum changes.
For a particular change in momentum the longer the time taken for the change, the smaller the force that acts.
When two vehicles collide, the force of the impact depends on mass, change of velocity and the duration of the impact.
The longer the impact time is, the more the impact force is reduced.
Crumple zones in cars reduce the forces acting by increasing the time taken to change the momentum of the car
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