Want to read Slashdot from your mobile device? Point it at m.slashdot.org and keep reading!


Forgot your password?

Slashdot videos: Now with more Slashdot!

  • View

  • Discuss

  • Share

We've improved Slashdot's video section; now you can view our video interviews, product close-ups and site visits with all the usual Slashdot options to comment, share, etc. No more walled garden! It's a work in progress -- we hope you'll check it out (Learn more about the recent updates).


+ - The Physics of the 'Levitating' Slinky

Submitted by
Hugh Pickens writes
Hugh Pickens writes writes "Robert Krulwich writes at NPR that there's a new science video making the rounds that has people saying "somebody doctored this footage. This can't be." In the video Derek Muller from the Australian science video website Veritasium takes a Slinky and holds it from the top with his hand then releases the lower part so it will slink down to its full extension, elongating, and come to a dangling rest. Now the professor will release the top of the slinky while they record run the footage at 300 frames a second (video). "Now comes the miracle. If you keep your eye on the bottom of the Slinky, on the last curl at the very end, you will notice that as the top of the Slinky starts to fall, the bottom doesn't drop. It just hangs in the air, levitating, as if it had its own magic carpet. It will stay there, hovering quietly, until a wave, or signal, passing through the Slinky finally reaches it," writes Krulwich. "Apparently, the bottom doesn't know it's supposed to fall, so it sits there, seeming to defy gravity, until the very end." According to a paper by physicists R. C. Cross and M. S. Wheatland the fall of the slinky illustrates the physics of a tension spring, and more generally wave propagation in a spring where because of tension in the spring, the bottom of the slinky cannot begin to fall until the top collides with it (PDF)."
This discussion was created for logged-in users only, but now has been archived. No new comments can be posted.

The Physics of the 'Levitating' Slinky

Comments Filter:

The major difference between bonds and bond traders is that the bonds will eventually mature.