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[Phys-L] Re: Gear suppliers



Howdy Dwight-

--- "Dwight K. Souder"
<crvhs_dks@CRESTVIEW-RICHLAND.K12.OH.US> wrote:

Can anyone recommend a good set of gears that can be
used in my high school
Physics/Advanced Physics classes? I'm looking for
something that is durable
and can be easily interchanged to see the effects of
the different
arrangements.

Pitsco sells a good transmission gear system. You
might be able to find these at your local hobby shop.
See
<http://www.shop-pitsco.com/pitsco3/finditem.cfm?itemid=3442>

But I hate to think small. Instead I use my bicycle.

I flip it over and rest it on its handle bars and
seat. It has three different rings on the front and
six on the back, giving it 18 gear combinations. It's
easy to count revolutions of the pedals to compare
with revolutions of the rear wheel.

Measuring the forces is a bit more complicated because
they tend to be on the large size, but a few years
ago, I bought some spring scales for weighing fish
which go up to 40 pounds from Harbor Freight.

Of course, you don't need the whole bike. If you had a
frame and the drive system, you could ditch the rest
of the bike. A bike shop might have extra parts for
rusty frames. Spray paint the frame, and away you go.


Marc "Zeke" Kossover
The Jewish Community High School of the Bay
San Francisco, CA 94121
<http://tochnit.jchsofthebay.org/~zkossover>



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