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Chapter 7: Q15Q (page 170)

Cars used to be built as rigid as possible to withstand collisions. Today, though, cars are designed to have 鈥渃rumple zones鈥� that collapse upon impact. What is the advantage of this new design?

Short Answer

Expert verified

The damage is lowered due to the presence of the crumple zone during a collision.

Step by step solution

01

Relation between the impact forces and duration of time

The change in momentum with a long duration of time decreases the impact force.

Let\(\Delta P\)be the change in momentum during a collision. The car takes\(\Delta t\)time of interaction during the collision.

Therefore, the average force acting on the car during the collision is:

\(F = \frac{{\Delta P}}{{\Delta t}}\)

02

Advantage of crumple zone

Due to the presence of a crumple zone in cars, the time of interaction during collision is increased. Therefore, the average impact force on the car decreases as the change in momentum is the product of impact force and time of interaction.

As the impact force decreases, the damage caused to occupants in the car also decreases.

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