in a collision the persons momentum is reduced to 0kg m/s which creates a large force to be felt, increasing the time, reduces the force felt.
CRUMPLE ZONES: chnage the momentum safely by reducing the force of a collision by having a longer time for the car to fully stop
SEAT BELTS: change the momentum safely by exerting a force on the person wearing the seat belt to increase the time to decrease the momentum
AIR BAGS: change the momentum safely by cushioning thr person in a collision to decrease the force of the crash on the passenger
if we had no friction the object would keep on moving with the same momentum UNTIL something else stops it.
counter force > | <driving force
If the counter force and driving force are equal we wull niove ar a constant speed (or stationery)
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