Subject:
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Re: baffled by a part in RIS 1.5
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Newsgroups:
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lugnet.robotics.rcx
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Date:
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Thu, 5 Apr 2001 13:36:25 GMT
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Viewed:
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3858 times
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In lugnet.robotics.rcx, Juergen Stuber writes:
> "Constantine Hannaher" <constantine.hannaher@hooshome.com> writes:
> >
> > Looking more closely in my Guide for the Use of the International System of
> > Units (SI), NIST Special Publication 811 (from the United States National
> > Institute of Standards and Technology) which sould be available as a PDF • from
> > their site www.nist.gov I see that while the newton is a special named unit • for
> > the derived quantity force, the newton meter is an expression of the special
> > named unit joule with symbol J for the derived quantities of energy, work, • and
> > quantity of heat. Hmm. Imagine if LEGO had written cJ on the clutch gear.
>
> Using a unit of energy for torque would be very strange.
> You get an energy if you turn s.th. against a torque through
> some angle (expressed in radians, I think).
> Angles have no unit (or just 1),
> hence the units of torque and energy are equal.
> Nevertheless, torque and energy are different concepts.
>
> Jürgen
Looking further, I note that the newton.meter is the preferred unit for the
quantity "moment of force" (also known as torque).
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Message is in Reply To:
 | | Re: baffled by a part in RIS 1.5
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| (...) Using a unit of energy for torque would be very strange. You get an energy if you turn s.th. against a torque through some angle (expressed in radians, I think). Angles have no unit (or just 1), hence the units of torque and energy are equal. (...) (25 years ago, 5-Apr-01, to lugnet.robotics.rcx)
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