the Hula Hoop

R

RichD

Guest
I was at the gym the other day, there was a girl doing that
shimmy thing, with a hula hoop. I haven't seen one of those
in a long long time...

And I got to wondering... what holds it up?

Where's Newton when we need him?

--
Rich
 
In sci.physics RichD <r_delaney2001@yahoo.com> wrote:
I was at the gym the other day, there was a girl doing that
shimmy thing, with a hula hoop. I haven't seen one of those
in a long long time...

And I got to wondering... what holds it up?

Where's Newton when we need him?
Click to expand...
The same thing that holds up a swung weight on the end of a rope.

--
Jim Pennino

Remove .spam.sux to reply.
 
RichD wrote:
I was at the gym the other day, there was a girl doing that
shimmy thing, with a hula hoop. I haven't seen one of those
in a long long time...

And I got to wondering... what holds it up?
Click to expand...
A hula hoop can be thought of as a rock on a string. The center
of mass of the hula hoop corresponds with the rock. Where your
body makes contact with the hoop corresponds with where your hand
holds the string.
 
RichD wrote:
I was at the gym the other day, there was a girl doing that
shimmy thing, with a hula hoop. I haven't seen one of those
in a long long time...

And I got to wondering... what holds it up?

Where's Newton when we need him?
Click to expand...
When the hoop is swinging around a post, it pulls against
the side of the post. That provides a friction force that
keeps it from sliding down. This is the inside out version
of what holds a motorcycle up as it is driven around the
inside of a big barrel. The trick is to move the post in a
way that not only keeps the swing going, but angle the post
enough to cause the hoop to climb up the post a little each
cycle, to compensate for the inevitable downward slip. But,
with practice, you can swing a hula hoop around a
broomstick, so hips, though useful, are not necessary.

--
Regards,

John Popelish
 
On Dec 24, 7:41 am, RichD <r_delaney2...@yahoo.com> wrote:
I was at the gym the other day, there was a girl doing that
shimmy thing, with a hula hoop.  I haven't seen one of those
in a long long time...

And I got to wondering... what holds it up?

Where's Newton when we need him?

--
Rich
Click to expand...
Her curves and centrifugal force, young man. Mostly her curves. They
work magic, particularly in holding things up.

Cheers
Chris
 
On Dec 24, 8:59 am, Sam Wormley <sworml...@mchsi.com> wrote:
RichD wrote:
I was at the gym the other day, there was a girl doing that
shimmy thing, with a hula hoop. I haven't seen one of those
in a long long time...

And I got to wondering... what holds it up?

A hula hoop can be thought of as a rock on a string. The center
of mass of the hula hoop corresponds with the rock. Where your
body makes contact with the hoop corresponds with where your hand
holds the string.
Click to expand...
Me at age 57-
http://users.accesscomm.ca/john/image002.jpg

The key is joint flexibility. All the vertebrae have to be able
to bend freely in all directions. This is everyone's condition
until our 20's when we start picking
things up.I was so stiff in my 30's I could hardly walk at times.
CHANGE OF DIET TO STRICT VEGAN works wonders.
Now I can hula-hoop and move my trunk freely and
without pain. It's wonderfully convenient for things like
retrieving items and seeing what time it is.

John
 
On Mon, 24 Dec 2007 07:25:07 -0800, malibu wrote:

things up.I was so stiff in my 30's I could hardly walk at times. CHANGE
OF DIET TO STRICT VEGAN works wonders.
Click to expand...
Does that mean you only eat stuff that's imported from the Vega system?

http://en.wikipedia.org/wiki/Vega

Cheers!
Rich
 
On Dec 24, 11:39 am, "Rich Grise, Plainclothes Hippie"
<r...@example.net> wrote:
On Mon, 24 Dec 2007 07:25:07 -0800, malibu wrote:
things up.I was so stiff in my 30's I could hardly walk at times. CHANGE
OF DIET TO STRICT VEGAN works wonders.

Does that mean you only eat stuff that's imported from the Vega system?

http://en.wikipedia.org/wiki/Vega

Cheers!
Rich
Click to expand...
How about gyro action that defies gravity.How about girls hips How
about friction,or all of the above. Sandra "Sunbeam".
 
On Dec 24, 1:39 pm, "Rich Grise, Plainclothes Hippie"
<r...@example.net> wrote:
On Mon, 24 Dec 2007 07:25:07 -0800, malibu wrote:
things up.I was so stiff in my 30's I could hardly walk at times. CHANGE
OF DIET TO STRICT VEGAN works wonders.

Does that mean you only eat stuff that's imported from the Vega system?

http://en.wikipedia.org/wiki/Vega

Cheers!
Rich
Click to expand...

No, here.
http://en.wikipedia.org/wiki/Vegan
It also takes the stiffness out of one's joints.
 
On Dec 24, 9:36 am, John Popelish <jpopel...@rica.net> wrote:
RichD wrote:
I was at the gym the other day, there was a girl doing that
shimmy thing, with a hula hoop. I haven't seen one of those
in a long long time...

And I got to wondering... what holds it up?

Where's Newton when we need him?

When the hoop is swinging around a post, it pulls against
the side of the post. That provides a friction force that
keeps it from sliding down. This is the inside out version
of what holds a motorcycle up as it is driven around the
inside of a big barrel. The trick is to move the post in a
way that not only keeps the swing going, but angle the post
enough to cause the hoop to climb up the post a little each
cycle, to compensate for the inevitable downward slip. But,
with practice, you can swing a hula hoop around a
broomstick, so hips, though useful, are not necessary.

--
Regards,

John Popelish
Click to expand...
(Chimpunks:)
Want a plane that loops the loop,
(Alvin:)I still want a Hula-Hoop.
(Chimpunks:)
We can hardly stand the wait,
Please Christmas don't be late.
We can hardly stand the wait,
Please Christmas don't be late.
 
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