Talk:Impact (mechanics)

From Wikipedia, the free encyclopedia
Jump to: navigation, search
WikiProject Physics (Rated Start-class, High-importance)
WikiProject icon This article is within the scope of WikiProject Physics, a collaborative effort to improve the coverage of Physics on Wikipedia. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.
Start-Class article Start  This article has been rated as Start-Class on the project's quality scale.
 High  This article has been rated as High-importance on the project's importance scale.


"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? (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. (talk) 06:50, 15 October 2008 (UTC)


The following discussion is closed. Please do not modify it. Subsequent comments should be made in a new section.

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)

The above discussion is closed. Please do not modify it. Subsequent comments should be made in a new section.

Write-off link[edit]

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)

External links modified[edit]

Hello fellow Wikipedians,

I have just modified one external link on Impact (mechanics). Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:

When you have finished reviewing my changes, you may follow the instructions on the template below to fix any issues with the URLs.

You may set the |checked=, on this template, to true or failed to let other editors know you reviewed the change. If you find any errors, please use the tools below to fix them or call an editor by setting |needhelp= to your help request.

  • If you have discovered URLs which were erroneously considered dead by the bot, you can report them with this tool.
  • If you found an error with any archives or the URLs themselves, you can fix them with this tool.

If you are unable to use these tools, you may set |needhelp=<your help request> on this template to request help from an experienced user. Please include details about your problem, to help other editors.

Cheers.—InternetArchiveBot (Report bug) 18:24, 9 April 2017 (UTC)