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-   -   Why do tense muscles make the body sink (or do they)? (http://www.totalimmersion.net/forum/showthread.php?t=595)

atreides 07-23-2009 09:39 PM

Quote:

Originally Posted by shuumai (Post 4567)
The overall amount of water shouldn't make a difference. One can float in a bath tub. (Though, at some small level, I wonder if there is a difference. If so, perhaps even the angle of the walls could have a small effect.)

My point is that the shallower the pool and therefore the smaller the amount of water, the lower an object will sink. Think of this way. Everything else being equal, why do you float better in a 6X6X4 pool than a 6X6X3 pool and even better in a 6X6X10 pool. Well there is 108 cubic ft of water pushing against you in the 3 ft deep pool versus 144 cubic ft of water in the 4 ft pool and 360 cubic ft in the 10 ft pool. That's why Elskbrev felt more buoyant in the 10 ft pool than he did in the 4 ft pool. He didn't sink as much in the 10 ft pool because it probably had a lot more water.

shuumai 07-23-2009 10:17 PM

Quote:

Originally Posted by atreides (Post 4571)
My point is that the shallower the pool and therefore the smaller the amount of water, the lower an object will sink. Think of this way. Everything else being equal, why do you float better in a 6X6X4 pool than a 6X6X3 pool and even better in a 6X6X10 pool. Well there is 108 cubic ft of water pushing against you in the 3 ft deep pool versus 144 cubic ft of water in the 4 ft pool and 360 cubic ft in the 10 ft pool. That's why Elskbrev felt more buoyant in the 10 ft pool than he did in the 4 ft pool. He didn't sink as much in the 10 ft pool because it probably had a lot more water.

Nope. If that were the case, people would float on the surface of an ocean. As long as there is enough water to fully surround your body, you will float if your body weighs less than the water it displaces.

If a ship floats in the ocean it will also float in the Panama Canal if it will fit in the lock.

Buoyancy seeming greater in deep water is a psychological reaction.

RadSwim 07-24-2009 01:33 AM

Archimedes' principle. The depth of the water does not enter into the equation. The water only needs to be deep enough to allow the bouyant object (in this case, the swimmer) to reach equilibrium.

http://en.wikipedia.org/wiki/Archime...s.27_principle

Physics is wonderful -- it dispels magical thinking.

shuumai 07-24-2009 02:13 AM

Quote:

Originally Posted by RadSwim (Post 4576)
Physics is wonderful -- it dispels magical thinking.

Well...seeing the "magic" in things is also useful. Think "beginner's mind."

Nicodemus 09-21-2013 02:31 AM

I just stumbled on this thread. I know it's a good few years old, but feel I have to reply for the benefit of anyone else asking the same question...

So - the original question was why do tense muscles make you sink, or don't they?

Answer - they don't. It's a complete fallacy. (Like so many myths in swimming).

Moral - don't believe everything you're told or read about swimming (which I would hope TI practitioners wouldn't!)


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