Naked Science Forum
General Discussion & Feedback => Just Chat! => Topic started by: tony6789 on 27/01/2006 20:15:38
-
any one have any good ideas for a science fair[:D]
-
Tony, I have an amazing one for a science fair.
How about causing water to flow vertically up a 6 mil bore tube to in excess of 24 metres, without using any kind of pump? which the laws of physics thinks is not possible :)
"The explanation requiring the fewest assumptions is most likely to be correct."
K.I.S. "Keep it simple!"
-
..............
- Big T
-
Tony
I think you need to talk to Naked Science member daveshorts
A link to his web site is below
http://www.chaosscience.org.uk/pub/public_html/index.php
Michael HAPPY NEW YEAR (https://www.thenakedscientists.com/forum/proxy.php?request=http%3A%2F%2Fi11.photobucket.com%2Falbums%2Fa186%2Fukmicky%2Fparty-smiley-012.gif&hash=844994fd61764508c533537d6874634d)
-
That's it !!...MICHAEL IS A STAR !!!
I've been racking my brain cell all day trying to remember that it's Daveshorts who can offer the best advice.
Nice One Michael !!
Men are the same as women.... just inside out !!
-
What about a colourful demonstration of photoelastic stress patterns: objects which are usually transparent
and colourless become multi-coloured if viewed through crossed polarising filters:-
(https://www.thenakedscientists.com/forum/proxy.php?request=http%3A%2F%2Fi24.photobucket.com%2Falbums%2Fc23%2FSUEDONIM%2FCOMBO.jpg&hash=11baf17a386fb31a887a4518068f76bf)
Just about any object made from transparent injection-moulded plastic will exhibit this property:
e.g. audio cassette cases (above left), CD cases. Plastic geometry set : ruler, protractor, set square.
Plastic containers: cups, beer mugs, bottles. Plastic packaging, including stretched polyethene bags. Etc.
APPARATUS:
LIGHTBOX *, from photographic store or 2nd hand on Ebay, usually used to view slides.
POLARISING FILM (lighting “gel”), from specialist / professional photographic store:
can be expensive, 10”x10” sheet costs approximately £20.
POLARISED SUNGLASSES, not necessarily “Polaroid” brand, but MUST be polarised.
A selection of transparent injection-moulded objects (see above list).
METHOD:
Switch on lightbox, place the sheet of polarising film on the light box.
Whilst wearing the polarising sunglasses rotate the polarising film / change your position
until the lightbox appears black (or very dark blue).
Hold a transparent injection-moulded plastic object over the black/blue lightbox,
the object should appear multi-coloured.
DRAWBACK / ADVANTAGE:
Only people wearing polarised sunglasses and standing in a particular position will see the multi-coloured effect.
* If you are at school you may be able to borrow an “overhead projector” which could be used as a lightbox.
You should have an adult, (e.g. science teacher), check that your exhibit is safe.
I believe “Daveshorts” is the best qualified person to advise you on interacting with the public when demonstrating / explaining science.
-
SOURCES OF POLARISING FILM :-
""
POLARISING FILM (1 per pack).
Linearly polarised film for reducing reflections or for polarisation experiments (e.g . View stress patterns in plastic items). Transmissivity: single sheet=42%, 2 sheets crossed polarisation=<0.15%. Thickness 0.14mm. Sheet 10cm x 5cm (makes two 5 x 5cm pieces). We can also supply this to order in sheets of 350mm wide cut to the lengh you require (in 10cm increments) at £29.35 per 10cm.
Ref: OPF0001 | Price: £5.99 | ""
http://www.greenweld.co.uk/acatalog/Shop_Experimental_75.html
-
It is possible to determine if sunglasses have polarised lenses by viewing a Liquid Crystal Display (LCD),
as used in digital wristwatches and pocket calculators, (black numerals on a grey background). Whilst wearing the sunglasses rotate the watch / calculator. If the sunglasses are polarised the LCD will either turn black,
(twice per complete rotation), or produce a multi-coloured display which changes during rotation.
A possible source of a large (12”x12”) polarising filter is an “anti-glare screen” designed for use with a computer monitor. Some of these screens MAY be polarising filters, perhaps readers who have them could verify this. If the screen is easily detachable the “LCD” test (above) could be used to establish whether the screen is a polarising filter, or if not readily detachable try rotating polarised sunglasses in front of the screen, (the lenses should go black twice per complete rotation).
----------------------
"" If you can't avoid bright light from a window, purchase an anti-glare screen to place over your monitor.
Generally, the best ones are polarized or have a purplish optical coating.""
http://www.ehow.com/how_113856_rid-screen-glare.html