Re: [Phys-L] Sonometer, What Do You Think of the PASCO Model?

[Bill Norwood <bnorwood111@gmail.com>]

Hi all,
- Has anyone considered the bass guitar with 4 tensile strain gauges just
past a "frictionless" bridge on the tuning end?
- I have no idea of the dimensions of, or how to shop for, such strain
gauges.
Bill Norwood


On Tue, Jul 29, 2014 at 5:10 PM, Bernard Cleyet <bernardcleyet@redshift.com>
wrote:

> On 2014, Jul 29, , at 11:27, Bill Norwood <bnorwood111@gmail.com> wrote:
>
> > In my perception it would basically ruin the experiment if one had to
> hang
> > tens of kilograms of weight off the end of the bass guitar.
>
>
>
> On 2014, Jul 29, , at 12:11, John Denker <jsd@av8n.com> wrote:
>
> > > In my perception it would basically ruin the experiment if one had to
> hang
> > > tens of kilograms of weight off the end of the bass guitar.
> >
> > We agree that would be the wrong way to go.  That's definitely
> > not what I was suggesting.
>
>
>
> Huh?   How hang Kg?
>
>
> Not long ago posted (horological list):  How much energy in a wound clock
> spring?  [Great care necessary when “unwinding” preparatory to cleaning.]
>
> So I clamped a stick (lever arm) to the key and wound using a Vernier
> force tducer.   Wow a lot!
>
> Anyway, attach a lever arm to the peg and …  Of course there’s a prob. w/
> the necessary friction.  I’ve not taken the time to check the construction,
> but suspect one may nock the peg lose from the head’s hole, tension, and
> then knock it back in when desired tension is obtained.   This method
> affords a discussion of the resultant “noise”, and is simpler than the
> displacement method.  [Not applicable, duh, if one wished to “teach” the
> displacement method.]
>
> bc
> _______________________________________________
> Forum for Physics Educators
> Phys-l@phys-l.org
> http://www.phys-l.org/mailman/listinfo/phys-l