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An air bag is used to safely decrease the momentum of a driver in a car accident. The air bag reduces the magnitude of the force acting on the driver by

User Meuk Light
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Impulse = Force * time = change in momentum
F = I / t
F = change in momentum / time
Airbag will increase the time of impact, which will in turn decrease the force (since time is in the denominator).
User Savinson
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