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Chapter 6, Problem 12CQ
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### College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300

#### Solutions

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Section
BuyFindarrow_forward

### College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300
Textbook Problem

# An air bag inflates when a collision occurs, protecting a passenger (the dummy in Figure CQ6.12) from serious injury. Why does the air bag soften the blow? Discuss the physics involved in this dramatic photograph.

To determine
The reasons that air bag soften the blow.

Explanation

The air bag protects the passenger can be explained by using the concept of momentum.

Linear Momentum: The linear momentum pâ†’ of an object of mass m moving with velocity vâ†’ is the product of its mass and velocity.

pâ†’=mvâ†’

• pâ†’ is the momentum of the object
• m is the mass of the object
• vâ†’ is the velocity of the object

Impulse: If a constant force Fâ†’ acts on an object, the impulse Iâ†’ delivered to the object over a time interval Î”t is given by

Iâ†’=Fâ†’Î”t

• Iâ†’ is the impulse on an object
• Fâ†’ is the net force acts on an object
• Î”t is the time duration through which force acts on an object

Change in momentum: Impulse of the force action on an object equals the change in momentum of that object. Fâ†’av is the average force

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