Talk:Impact (mechanics)

Example
"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

There. Doesn't that turn into a nice number? 130.184.250.29 (talk) 16:51, 7 October 2008 (UTC)


 * I removed the example per WP:NOTTEXTBOOK. --Wizard191 (talk) 17:48, 7 October 2008 (UTC)


 * 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. 130.184.250.29 (talk) 06:50, 15 October 2008 (UTC)

Title
The title suggests that impact is a force when it is often better described as a shock (or transient acceleration). The title should be "Impact (mechanical)". Rlsheehan (talk) 01:10, 22 May 2009 (UTC)


 * Agreed, but I recommend Impact (mechanics) or Impact (physics). Wizard191 (talk) 11:52, 22 May 2009 (UTC)

Write-off link
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)


 * I don't have a problem with lateral thinking, but this seems like quite a stretch. If you strongly feel that it is pertinent then I'll concede. Wizard191 (talk) 22:21, 16 December 2009 (UTC)

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