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Originally Posted by gascort
You can double a car's mass and expect it to stop in the same distance if all else is held constant (especially center of gravity).
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OK, I've got a little experiment you can try. Take a pickup (say my '88 Toyota), accelerate to a reasonable speed, and measure your stopping distance. Now put a good load in the bed (say a load of logs for firewood), accelerate to the same speed, and again measure your stopping distance. Bet you find that they aren't the same - 'cause I've tried it :-)
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A LARGER car is more safe in all accidents, especially one that's designed to crumple and absorb energy over a greater distance...
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There you go again, with that thing you know for sure that just ain't so. See the actual real world data, as in e.g. the Wenzel & Ross paper I mention.