2008年11月10日 星期一

How to make a rope that won't swing by strong wind?

With a rope by itself, it would be impossible to do so. To make something unaffected by a strong force in anything, there are two directions to go:
A. When the force is absorbed and transformed into thermal energy, i.e. the uniqueness of directionality of the external force is destroyed by the internal structure of the rope;
B. When we could use the force to turn against itself, i.e. when we can led the force to interact with the rope to achieve a self-contradiction, then logically and physically the force can achieve nothing.
Since A has been discussed throughly in any ordinary level material Physics textbook, so I am more interested in discussing B. To produce a self contradiction, a rope by itself is not suffice to do so. We need two columns that is fixated on the group; then we make a knot on one side column, and we fix the rope from left side of one column to right side of another column so it pass each location only once.
Now when wind hit the rope in any direction, it would attempt to extend the part of the rope that is nearer to the source of wind. So because of this construction, when it attempt to extend the rope on one side then the other side would react by contract (since the rope has limited extensibility.) However, because the two parts are parallel to each other(and perpendicular to the direction of wind), then the force goes into extending the part of the rope closer to the source of wind also attempted to extend the part of the rope that is further from the source of wind. Therefore, through this construction, the force of wind is led to acting against itself in the rope, thus however the strength of the wind, the rope will never swing.
Can we extend this idea into areas other than Physics?

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