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Chapter 9: Problem 6

Why are cars designed so that their front ends crumple during an accident?

Short Answer

Expert verified
Cars are designed with crumple zones so that during an accident, the front end crumples to spread the momentum change over a longer period, thereby reducing the force experienced by passengers. This is based on the physics principle that force equals the rate of change of momentum.

Step by step solution

01

Understanding Crumple Zones

Crumple zones are areas in vehicles that are designed to deform and crumple in a collision. These areas are typically found at the front and rear of the vehicle. Crumple zones are important because they absorb the energy from the impact during a crash, reducing the force exerted on the passengers inside.
02

Applying Physics Principles

In physics, a basic principle is that force is equal to the change in momentum per change in time. In simpler terms, this means that if momentum changes abruptly, the force will be very high (a bad thing in a car accident). Therefore, by extending the time over which the collision occurs, we can reduce the force exerted during the collision.
03

Connecting the Concepts

When a car is designed to have its front end crumple upon impact, the momentum change happens over a longer period of time due to this crumpling (since the car structure gradually slows down upon impact). The result of this is that less force is exerted on the passengers, thereby reducing the risk of injury.

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