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. The 2 main catalogs I've been looking through are Frey and
Flinn. It's kind of hard to tell the quality of the gears just by looking
in the catalogs. Also, if anyone knows any other companies I should look at
(catalogs or websites), I would appreciate it.