Chapter 8, Problem 9A

In a car crash, why is it advantageous for an occupant to extend the time during which the collision takes place?

To determine

The reason that it is advantageous for an occupant to extend the time during which the collision takes place.

Answer to Problem 9A

It reduces the force exerted on the car during a collision.

Explanation of Solution

Introduction:

Impulse on an object is given by,

  $F\Delta t=\Delta p$

Where,

  $F=$ force exerted on an object

  $\Delta t=$ time taken to change its momentum

  $\Delta p=$ change in momentum of the object

In a car crash, the change in momentum of the car will be same.

Consider the above mentioned formula, if the time taken during collision increases anyhow, then the force that will be exerted on the car during collision will be less.

Conclusion:

Hence, to experience the less force on the car, it is suggested to increases its time of collision during a car crash.