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?

It disperses the impact and more slowly brings the object in motion (head/body) to a state of rest. By pushing into the airbag and the airbag venting the air, more time is allowed for deceleration. The instant deceleration of striking an object, such as a steering wheel, is usually what causes injury/fatality.

Short answer - dispersing the energy of impact and slowing the rate of deceleration.

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