This provides a synopsis of my sister's 4
th-grade
science-fair project.
Presented in March 2003, she chose the conservation of
angular momentum as her topic.
With the help of her older sister as a model and assistant,
the hardware, photos, and movies were taken as data for the
experiment.
Below are pictures of the project with a movie showing
the conservation of angular momentum in action with a
brief explanation.
Construction |
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Materials:
- Bicycle wheel
- Wheel pegs
- Two circular boards
- Ball-bearing rings
- Wood screws
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Materials |
Wheel |
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Purchase of the hardware |
Fabrication of the platform |
Assembly of the wheel |
Experiments |
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Spin A 1 |
Spin A 2 |
Spin A 3 |
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Spin A
A lighter subject rotates more ...
Spin B
than a heavier subject.
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Spin A 4 |
Spin A 5 |
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Spin B 1 |
Spin B 2 |
Spin B 3 |
Movie |
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The conservation of angular momentum states, that the total angular
momentum before an event will be equal to the total angular
momentum after the event.
When the wheel is inverted, the system maintains constant angular
momentum by rotating the subject in the opposite direction.
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View Movie |
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Copyright © 2008
Michael Forman
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Gay shlafen: Yiddish for "go to sleep".
Now doesn't "gay shlafen" have a softer, more soothing sound than the
harsh, staccato "go to sleep"? Listen to the difference:
"Go to sleep, you little wretch!" ... "Gay shlafen, darling."
Obvious, isn't it?
Clearly the best thing you can do for you children is to start
speaking Yiddish right now and never speak another word of English as
long as you live. This will, of course, entail teaching Yiddish to all
your friends, business associates, the people at the supermarket, and
so on, but that's just the point. It has to start with committed
individuals and then grow....
Some minor adjustments will have to be made, of course: those
signs written in what look like Yiddish letters won't be funny when
everything is written in Yiddish. And we'll have to start driving on
the left side of the road so we won't be reading the street signs
backwards. But is that too high a price to pay for world peace?
I think not, my friend, I think not.
-- Arthur Naiman, "Every Goy's Guide to Yiddish"
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