Final Presentation Layout/Notes for SSS '05
Two shows - 11 AM and 2PM, each 50 minutes long.
Very Attractive Science
We start with science that is attractive to the senses.
- Scent Shooter - Weber
- Supplies: Shooter, scents: vanilla, peppermint, atomizer, smoke generator *Dennis* - *Tim* has in classroom
- Use while people are walking in
- Talking points: none
- Laser box - Weber
- Supplies: Smoke generator, "the box", laser pointer, dry ice?
- Talking Points: optics - *reflection*
- *Jeff* is building "the box".
- Rainbow - Weber
- Supplies: Diffraction grating, overhead projector, filters, paper to
- create slit - *Tim* has in classroom
- Talking Points: optics - *refraction*, how diffration grating splits white light, white light contains all colors,
- visually attractive.
- Hand out gold (gum) at the end of the rainbow
- Supplies: Diffraction grating, overhead projector, filters, paper to
- Color Wheel - Weber
- On order - *Linda*
- Talking points: make white light, light vs pigment?
- Aurora video and CME animations - Rock
- This is a good place to transition from sensually attractive science to electromagnetically attractive science, since the aurora is an example of both.
- *Dolores* has aurora animation, *Dennis* has CME animation.
- *Dolores* is giving video to *Dennis* to add to our presentation.
- Talking points: earth's magnetic field, magnetic field compressed on day side, stretched on night side, solar wind pulls magnetic field from day side to night side, compresses field, gets closer to poles, ions excited by solar energy, emit light
- Iron filings in oil - Rock
- Supplies: this needs the camera for sure
- Suffers from 1/R2. *Tim* tried this with a stronger magnet and got a better result.
- Talking points: Earth's magnetic field (tie to aurora) vs magnetic field of a bar magnet.
- Night Light - Janine
- The night light filament will vibrate under the influence of a strong magnet.
- Supplies: magnet, night light, extra bulbs - *Janine* will get these together and try it this weekend.
- Talking points: Anytime electricity flows, it produces a magnetic field. Magnet has a north pole and a south pole. Opposites attract, like repel. E-field around wire is interacting with the B-field of magnet. Vibrates b/c of AC current - flows through the wires in one direction stops and flows the other way. Every time it reverses, the magnetic field reverses too. alternates 60 times every second. What would happen if you used a bulb lit by direct current? Direct current always flows in the same direction, so the magnetic field would be constant. The filament would not vibrate.
- Cu Tube and Neo Mags - Janine
- Supplies: in classroom with *Tim*, need specs from *Randy* so can get a slit cut in the tube so audience can see the magnet fall.
- Talking points: Eddie currents set up in Cu tube by passage of Neo mags cause mag field opposing gravity which slows down fall of magnet.
- Levitation Mags - Janine
- *Tim* is trying to hunt these down.
- Talking points: Super-cooled superconductor, magnetic field induces a current in the superconducting disk, which creates a B-field opposing the magnet above it, causing levitation.
- Fire Tornado - Tim
- *Tim* has this in the classroom
- This is back to visually attractive, but it's WOW factor is high so we want it later in the show?
Talking points: Large forest fires create updrafts causing air to be sucked into the base of the fire (wind toward the fire). Competing hot spots and terrain can lead to rotation -> fire tornado, which can spin off and head away from the fire. NCAR research, http://www.ucar.edu/communications/quarterly/summer96/fire.html
http://mayhem-chaos.net/photoblog/archives/2004_09.html Scroll down to fire tornado. Maybe we can build this next year
Fire tornado spawned by the California wildfires 2003
- Lightning demo - Tim
- *Tim* has all the supplies for this
- Talking points: Tim...
- Tesla Coil Stela (if working)/Baby Tesla Steletta (if not) - Tim
- *William* is repairing Stela. Hopefully she will be in top form for practice before SSS. William will also give us the cards he usually talks from. Does one of us need to don a lab coat and wild, white hair? (-:
- Gravity check throughout
- Supplies: water balloons, aquarium, helium balloons, tacks, Xmas light bulb, flat rock - *Janine*, pyramid *Jeff*
- *Do we have access to He through work, or do we need to rent a canister from Target or a party store??*
- Only put a few ml of water in each balloon for splash effect.
-- Main.JanineGoldstein - 21 Oct 2005
Topic for 2005: Electricity and Magnetism
- "Very Attractive Science"
- "Journey to the Center of the life giving dynamo!"
- "Super Solar Science"
- "Journey to the Center of the Sun!"
i.e., the Sun as an example of an enormous magnet and "a collection of magnets [i.e. the smaller magnetic fields]" We could do demos of magnetism, transition to a electricity format with Stella [William's Tesla Coil] and then do some electricity and magnetic levitation demos
- Tessla coils
- take advantage of the Weber tie-in, i.e. Weber as a unit of magnetic flux, and Weber as Jeff's last name
- Build a really big electromagnet
- Build a really big radio
Windows to the Universe magnetism activities: http://www.windows.ucar.edu/tour/link=/teacher_resources/magnetism/teach_magnetometer.html http://www.windows.ucar.edu/tour/link=/teacher_resources/magnetism/teach_extension.html http://www.windows.ucar.edu/tour/link=/teacher_resources/magnetism/teach_terrabagga.html
And Randy has others. He's in charge of magnetism (for Windows, not general magnetism, as far as I know). These would all have to be modified if they were to be done with a large audience.
Quickie Demo's from ASTC via Linda - Janine 18 Oct 2005
Hi! They did two quickie demos at the ASTC showcase that might make good warmups, if not this year, sometime in the future. Both are "chemistry" demos:
1) Pour hydrogen peroxide (H2O2) into a small clear beaker
- Explain how it is already releasing oxygen into the air Add a few squirts of Ivory into the beaker Pour a few ounces of a ammonium iodide into beaker Huge snake of bubbles appears
2) Fill a beaker with isopopyl alcohol
- Ask someone in the audience to "lend" you a dollar bill Submerge bill in the alcohol
- Extract with long metal tweezers Light match Light bill Note that the bill flames but does not burn
I just added this one That Teri Found - Tim 15 Nov 2004
This Week's Experiment - #401 Light Vibrations
For this one, you will need:
a nightlight with a clear bulb a strong magnet
Plug in the nightlight and turn it on. You will notice that the light is coming from a thin wire inside, called a filament. As electricity moves through the wire, some of the electrical energy is converted into heat. The wire gets hot enough to glow brightly.
Warning! This experiment may cause the light bulb to go bad, so be sure to have a spare handy.
Next, bring a powerful magnet near the bulb. Bring it as close to the filament as you can and watch closely. You should see the filament begin to vibrate rapidly back and forth. Why is it doing that?
Anytime electricity flows, it produces a magnetic field. If you have ever played with magnets, you probably know that every magnet has two ends, a north pole and a south pole. Two poles that are different will pull towards each other. Two poles that are the same will push away from each other. The electric field around the wire is interacting with the field of the magnet you put nearby. One part is pulled towards it, and the other part is pushed away.
But why is it vibrating? Because the flow of electricity in the wire is changing. You are lighting the bulb with alternating current. Just as its name suggests, alternating current alternates. It flows through the wires in one direction, and then it stops and flows the other way. Every time it reverses, the magnetic field reverses too. The north pole becomes the south pole. The part of the field that was being pulled towards the magnet is now being pushed away. Then the electricity reverses again, and it is again pulled towards the magnet.
Here in the United States, our electricity alternates 60 times every second. In some countries, it alternates 50 times per second, but either way, the experiment should work for you. If you don't see the vibration, try using a more powerful magnet or a different light bulb.
What would happen if you used a bulb lit by direct current? Direct current always flows in the same direction, so the magnetic field would be constant. The filament would not vibrate.
As I said earlier, this experiment may weaken the filament, causing the bulb to go bad. Have a spare bulb available, just in case, especially if this is the nightlight that you depend on for midnight ice cream emergencies.
How Toons 2/14/2005
From MIT. These are just plain cool!!!! http://www.howtoons.com
-- Main.JanineGoldstein - 20 Apr 2006