Re: science teacher needs help
- From: "CWatters" <colin.watters@xxxxxxxxxxxxx>
- Date: Thu, 20 Oct 2005 07:31:02 GMT
"semidemiurge" <rick.fetters@xxxxxxxxx> wrote in message
news:1129781731.823853.227040@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> I need a simple solution for a classroom science project. I am a
> science teacher and I am constructing apparatus to demonstrate that a
> projectile drops at the same rate as an object falling in the vertical
> axis alone.
> I have the target released by energizing a solenoid, this is suppose to
> happen when the projectile exits the muzzle of a blowgun. My problem
> is how to energize the solenoid by the passage of the dart out the
> muzzle. One thought was using a NO microswitch but it causes a
> deflection in the path of the dart no mater what I do.
Use an optical switch - These are sometimes used on shop doors. They
typically work by bouncing a beam of light or IR light from a reflector.
When someone walks through the beam it's broken and a bell sounds.
.
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