Question #905da

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Question #905da

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Answer 1 · 2017-04-13T19:12:58

It's in Newton's 2nd law

Explanation:

The force you experience during a crash is defined by Newton's 2nd law.

$F = m a = \frac{m v - mu}{t}$ $F=ma=(mv-"mu")/t$

Where $v$ $v$ is the final velocity and $u$ $u$ is the initial velocity. In a crash, we can assume $v = 0$ $v=0$ so this reduces to

$F = - \frac{mu}{t}$ $F=-"mu"/t$

Hence the force exerted on a person in a crash is a function of three things, mass, initial speed, time to come to a stop. Once a crash is initiated, there is not much you can do about u and m. However, the longer the time period over the deceleration, the less force you will experience. This is where the seat belt comes in. It stretches during a collision, increasing the time over which the force is exerted on the passenger, thereby reducing the force they experience.

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Question #905da

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