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Physic question,driver inside 2 very small car collison suffer more injury or 2 very large car?

2 smallest hatch back vs 2 large pick up truck collision.Which one post more injury to passenger?
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ArishMell · 70-79, M
The forces involved are dependant on mass as well as velocity so increase with both.

The occupants' survival the collision depends much more on how well the vehicle withstands the impact, and on how well the occupants are protected by vehicle design and on precautions like wearing the seat-belts.

In a frontal collision an unrestrained occupant (not wearing a seat-belt) will be propelled forwards with the momentum from his or her own mass and the original speed just at point of collision, and irrespective of vehicle type. (Momentum =mass X velocity.)

If the driver is unrestrained and suffers a head-on crash at speed he or she will smash into the steering-wheel and windscreen with just the same force whether driving a 40-tonne lorry or a small saloon car.

Modern cars are designed to absorb a lot of the force by crumpling in such a way that it reduces the risk of crushing the occupants by the engine being forced back into the interior; and of course are fitted with protective devices like air-bags, seat-belts and glass made to shatter rather than break into shards. They are also lighter than their equivalents built, say, fifty years ago, so the overall forces are lower.