| Topic: |
Science > Physics |
| User: |
"Bradders" |
| Date: |
04 Feb 2005 09:26:04 AM |
| Object: |
Oscillating Ball in Plughole |
If you fill a sink with water and then remove the plug and place a
light ball (eg ping pong ball) directly above the hole, it starts to
oscillate. Any ideas on why it does this?
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| User: "Uncle Al" |
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| Title: Re: Oscillating Ball in Plughole |
04 Feb 2005 11:50:00 AM |
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Bradders wrote:
If you fill a sink with water and then remove the plug and place a
light ball (eg ping pong ball) directly above the hole, it starts to
oscillate. Any ideas on why it does this?
Suspend a pingpong ball in an air stream. Push + weight comes to the
same thing as pull + boyancy. Add feedback.
Usenet's cloaca,
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| User: "tj Frazir" |
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| Title: Re: Oscillating Ball in Plughole |
04 Feb 2005 07:02:08 PM |
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It cant speed up so it changes directions.
go 10 feet under and let the ping go and as it moves up it will move
side to side.
a heaver one will go slower and not side to side.
V is the same then up and down ,,the ball is not going up and not
going down but moving side to side.
evry tme it moves to the side is becase it cat speed up.
test speeding up ,,drag the ping pong underwater by a string.
YOU test it and isolate what you think it is and then test that.
Uncle idiot was wrong.
it moves back and forth because it cant speed up.
Ill prove it with some math.
water psi is more against the top of the ping because its moving.
at some point a constant speed oposes the resistace of motion VIA more
psi at its top till its speed is absolute.
But now it has a low on each side of it.
If I add a bit more speed it will be pushed into the low beside the ping
..
That springs it back agains the low on the other side as its pushed as
well.
it cant go faster so it changes directions.
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