Bug 181424

Summary:	Definition of inertia in Polygon.html is wrong
Product:	[Applications] step	Reporter:	Burkhard Lück <lueck>
Component:	general	Assignee:	Vladimir Kuznetsov <ks.vladimir>
Status:	ASSIGNED ---
Severity:	normal	CC:	aditya.gnu, aspotashev, sreejiththulaseedharan
Priority:	NOR
Version:	unspecified
Target Milestone:	---
Platform:	Compiled Sources
OS:	Linux
Latest Commit:		Version Fixed In:
Sentry Crash Report:

Description Burkhard Lück 2009-01-20 20:19:46 UTC

Version:            (using Devel)
OS:                Linux
Installed from:    Compiled sources

step/objinfo/Polygon.html says:

inertia: How difficult it is to change the polygon's rotation.

This definition is misleading and wrong, because inertia is not only the resistance against rotation, but against any change in its state of motion.

Quoting http://en.wikipedia.org/wiki/Inertia:
"Inertia is the resistance of an object to a change in its state of motion."

Comment 1 Burkhard Lück 2009-01-20 20:54:31 UTC

same definition error in
Disk.html
Box.html

Comment 2 Vladimir Kuznetsov 2009-02-02 12:52:08 UTC

The deffinition is correct, but the name is wrong. Actually it should be "moment of inertia" instead of "inertia". I can't remember why I've named it this way, but it should be renamed.

Do you have any ideas for something shorter than momentOfInertia ?

Comment 3 Burkhard Lück 2009-02-02 17:37:33 UTC

> The deffinition is correct, but the name is wrong. 

Ups, than I translated it wrong in german :-(

> Do you have any ideas for something shorter than momentOfInertia ?

No, "Moment of Inertia" seems to be correct.

Is the name also wrong in the gui?
step_qt.pot
#: rigidbody.cc:43 softbody.cc:51
msgctxt "PropertyName"
msgid "inertia"
msgstr ""

Comment 4 Vladimir Kuznetsov 2009-02-02 18:10:15 UTC

Yes, GUI should also be fixed.

It's not easy to change the name in Step itself since it is also used in .step files - changing it will break all existing step experiments. The proper solution is versioning of .step files which is started but not fully implemented yet.

Comment 5 aditya 2010-05-27 05:21:36 UTC

I have made the changes and i have send the patch to kde-edu mailing list.i have changed "inertia" to "rotationalInertia" The changes won't break the existing experiments as i have made the same changes in the .step files also. If there is any files other then what i have fixed, send those files to me. I will fix it

Comment 6 Justin Zobel 2021-03-09 07:29:35 UTC

Thank you for the bug report.

As this report hasn't seen any changes in 5 years or more, we ask if you can please confirm that the issue still persists.

If this bug is no longer persisting or relevant please change the status to resolved.