(Theory)
The string has a high rotation speed when the person forces it to go off the engine and touch the ground.
With that acceleration, the centripetal force that the string has is enough to defeat gravity's pull - so, it doesn't falls - and also enough to push itself forward , by touching and propelling on the ground.
But of course, friction and gravity make this acceleration lower in time to the point the string no longer has that force, and thus, falls to the ground.
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Now, if this is refering to the actual "strings theory" (http://en.wikipedia.org/wiki/String_theory ), I have no idea how this is related to it.
Furthermore, although I repeat I have no idea how these two things would be related, the statement of "demonstration" would be wrong, since the the string theory is, indeed, a theory, and hasn't been demonstrated.
The string has a high rotation speed when the person forces it to go off the engine and touch the ground.
With that acceleration, the centripetal force that the string has is enough to defeat gravity's pull - so, it doesn't falls - and also enough to push itself forward , by touching and propelling on the ground.
But of course, friction and gravity make this acceleration lower in time to the point the string no longer has that force, and thus, falls to the ground.
--
--
Now, if this is refering to the actual "strings theory" (http://en.wikipedia.org/wiki/String_theory ), I have no idea how this is related to it.
Furthermore, although I repeat I have no idea how these two things would be related, the statement of "demonstration" would be wrong, since the the string theory is, indeed, a theory, and hasn't been demonstrated.
Dadada dadada da.