|WikiProject Physics||(Rated Start-class, High-importance)|
|This article is written in American English (labor, traveled, realize, defense), and some terms used in it may be different or absent from other varieties of English. According to the relevant style guide, this should not be changed without broad consensus.|
"For example, a train that weighs 1 kg moving at 500 m/s and that hits a 'perfect' steel wall where it uniformly decelerates from 500 m/s to 0 m/s in .02 seconds, has an approximate impact force of 25000 N. Thus, a body which decelerates more quickly has a greater effective impact than one which decelerates more slowly."
I'm not doubting the calculation here, but the example is a bit unusual. 500 meters per second is equivalent to about 1118 miles per hour, faster than a bullet train. And a 1 kg train is like a toy train or something... so in my head I'm imagining a toy train breaking the sound barrier and smashing into a steel wall. I'm not sure what a typical train weighs (maybe 50,000 kg), but apparently their max speed is about 50 mph or 80 km/h or 22.222 m/s.
50,000 kg * 22 m/s / 0.02s = 55,000,000 N
- Eh, alright. Although examples are helpful in understanding the stuff. I realized soon after posting my example that the impact force from a large collision isn't well distributed throughout (it's mainly in the front where it hits) and can get very complex, so it wouldn't be a good example. 220.127.116.11 (talk) 06:50, 15 October 2008 (UTC)
I don't see how this link is applicable. A "write-off" is an accounting term. It is used as a slang term to indicate a crash that has total a vehicle, but I think that slang terms should not be included as a see also link. Wizard191 (talk) 16:17, 16 December 2009 (UTC)
- Crash damage is usually impact damage: if you don't like the link, remove, but I think lateral thinking can be helpful to readers. I also plan to use one or other of the pics there when I expand the impact article further. Peterlewis (talk) 18:36, 16 December 2009 (UTC)
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