[Phys-L] Re: Energy & Projectile Lab

[Bernard Cleyet <anngeorg@PACBELL.NET>]

Dwight!

You are in luck if you have some counters.  I inherited a bunch of home
made (UCB electronics shop)  photo. gates.  They require an ac supply to
power the small incandescents.  The photocell is self powered, I think
(not a photo conductor).   If you are interested I'll send you a pair.
You'll need to be or have a person someone adept at interfacing it w/ a
counter.  An alternative is I also have a bunch of the old Vernier
ULI's;  the software is now free, but requires the old RS232 (I think *)
connection, not USB.  This could be a project for one of your gung ho
students.  Since I'm retired AND if it works I'd like reimbursement for
the post (only).  Actually the tacit? agreement w/ the dept. (Berkeley)
was I give them away.   If you're interested, but a little doubtful I'll
send pics. of the stuff.

* Yes if used w/ IBM platform.  Berkeley Physics used Macs or Apples?

Another alternative is I also have from NPS and Berkeley ancient clock
type timers.  A nice project would be to interface a solid state relay
to switch on and off.  Back in the 60's? they called mixed tube and
transistor stuff hybrid;  this gives new meaning to the term.

bc

p.s the photogates were made for a timer of which I only have a few,
sorry.  With one of the timers I will verify the gates I send are working.

p.p.s. I've sent this to the list, so if Dwight doesn't bite someone
else at a penurious school may.

Dwight K. Souder wrote:

> Thank you for everyone who had responded.  I figured that the rotational
> inertia and friction would play a factor, but I was hoping that it wouldn't
> play that big of a factor.
>
> At my school, we don't have photogates...unfortunately.  I was hoping to be
> able to do without them.
>
> I do like the idea of "Newton's golf" by John Denker
> (http://www.av8n.com/physics/img48/golf.png) and plan on testing out that
> idea.  Can anyone suggest where I might be able to find large metal ball
> bearings?  If I can't find metal balls, I may test it using golf balls.  Any
> suggestions?
>
> I also like Stacy Kissel's suggestion of placing hoops through the path of
> the projectile.  That would be an interesting activity.
>
> For those who do this lab (preferably without photogates), would you mind
> emailing me your lab?  If I do use it (or part of it), I do give credit to
> those people.  My direct email is:  crvhs_dks@crestview-richland.k12.oh.us
>
> Also, if anyone is looking for ideas of some activities, check out my
> website (below) and click on "Science Conference Lessons".  These are just
> some of the things we do in class.
>
> Thank you and have a great day!
> Dwight Souder
> http://www.crestview-richland.k12.oh.us/HS/Faculty/Souder/myweb4/index.htm
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