Breaking Boards
Moderator: Available
I'd love for you to get more technical. I'm still not seeing why the pressure difference or the comparison to the plane's wing if what I said I think is right is right. Even if it takes me a (long) while, I think I can follow most physics. If nothing else I can quote your physics and then break some boards to pick up some girls with the combo.
-
Bill Glasheen
- Posts: 17299
- Joined: Thu Mar 11, 1999 6:01 am
- Location: Richmond, VA --- Louisville, KY
John
I've befriended (and even dated) enough Scotts in my life to be familiar with the caber toss. And while you correctly stated that it is a game of accuracy, it takes a minimum level of power to toss a pole that big with enough force to rotate it in a perfect 270-degree forward vertical plane.
One thing you can say about the Scotts is that they do have a few big boys. A young Scottish lassie I dated in the past was the only woman I personally knew other than my wife who could bench 145. And me wife has a bit of the Scottish blood as well. (Scotch-Irish and German).
- Bill
I've befriended (and even dated) enough Scotts in my life to be familiar with the caber toss. And while you correctly stated that it is a game of accuracy, it takes a minimum level of power to toss a pole that big with enough force to rotate it in a perfect 270-degree forward vertical plane.
One thing you can say about the Scotts is that they do have a few big boys. A young Scottish lassie I dated in the past was the only woman I personally knew other than my wife who could bench 145. And me wife has a bit of the Scottish blood as well. (Scotch-Irish and German).
- Bill
-
Bill Glasheen
- Posts: 17299
- Joined: Thu Mar 11, 1999 6:01 am
- Location: Richmond, VA --- Louisville, KY
Please explain to me what would happen to the air in front of the wing if the air at the back of the wing was going at a different speed. Think this through. I think you will find that it cannot happen.TSDGuy wrote: The commonly held belief that you see in physics classes from "The Wonder Years" is that the air moves over the top of the wing faster than the bottom of the wing in order for them both to reach the other side at the same point. But there is no reason for the the air on top and air on bottom of the wing to reunite at the same time.
These kinds of crazy things happen in tube fluid flow as well. Did you know that red blood cells travel faster than plasma in capillaries, and yet the plasma and capillary flow is constant? The other freaky thing that happens is that the hematocrit (percent of blood that is RBC) is lower inside the capillaries than it is outside. And yet everything is equal on the inflow and outflow of the capillary beds. That's an exact analogy in your own circulatory system.
The fact that air molecules must go a longer path and yet meet equally at the end means that the air molecules get stretched out farther from each other on the top of the wing than they do on the bottom. Air has a lower concentration on the top, but travels the longer path faster. The concentration of air molecules per unit volume happens to be air pressure. That means the air pressure is lower on the top of the wing than it is on the bottom. The pressure gradient causes the wing to have "lift."
It takes a while to absorb these concepts.
- Bill
You helped clarify the Bernoulli Effect, so I assume that's what moves the ball. I disagree with you that's what lifts a PLANE just from common sense and the reasons I listed, but if you say that's what moves a ball, I can understand. I'd be interested if you had some resources readily avaivable to read. Crazy and interesting stuff, physics is.
And don't forget this is the "World Year of Physics" in honor of the 100th anniversary of Einstein's Annus Mirabilis.TSDguy wrote: Crazy and interesting stuff, physics is.
http://www.physics2005.org/
Lots of interest in, and promotion of, physics going on this year.
Glenn
-
Guest
Caber Toss
Bill,
The caber tossers are definately big men. They have to right the caber from a horizontal ground position, lift it from the bottom- which requires a dead lifter's thighs, back and arms,- balance and stabalize then heave the trimmed tree trunks selected by the judge. Strength is essential and the younger contestants have a weight training regimen in the off season like the NASCAR Pit Crew boys.
My post was simply to clarify that distance is not the required object but position and accuracy determine the winning toss.
The sheath toss requires a different athlete. They use a pitch fork to pitch a tied sheath of grain stalks over an adjustable pole vault bar.
I don't know the team member limit but the tug of war requires yet another test of strength and endurance. Each team has let's say for the sake of example, 20 heavy men on each side laying out in a nearly horizontal position pulling in opposite directions. They hold in a static position until their team captain( who does not hold the rope) spys that the opponents have tired and he dips his flag. The big boys dig in and pullllll until one side weakens. How exactly is the winner determined?
The caber tossers are definately big men. They have to right the caber from a horizontal ground position, lift it from the bottom- which requires a dead lifter's thighs, back and arms,- balance and stabalize then heave the trimmed tree trunks selected by the judge. Strength is essential and the younger contestants have a weight training regimen in the off season like the NASCAR Pit Crew boys.
My post was simply to clarify that distance is not the required object but position and accuracy determine the winning toss.
The sheath toss requires a different athlete. They use a pitch fork to pitch a tied sheath of grain stalks over an adjustable pole vault bar.
I don't know the team member limit but the tug of war requires yet another test of strength and endurance. Each team has let's say for the sake of example, 20 heavy men on each side laying out in a nearly horizontal position pulling in opposite directions. They hold in a static position until their team captain( who does not hold the rope) spys that the opponents have tired and he dips his flag. The big boys dig in and pullllll until one side weakens. How exactly is the winner determined?
