h a l f b a k e r y
Contrary to popular belief
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//it pulls itself into a tighter radius//like an ice skater? |
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I'm going to try this - but how do you actually get inside
the egg - you didn't explain that part very well? + |
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The friction conjecture seems sound, and could be tested in a high school lab: |
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Construct a number of egg-table pairings with varying coefficients of friction. |
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To do this, use different table top surfaces and maybe even manufacture 'eggs' from different materials. |
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Look for any correlation between the coeff. of friction and the propensity to spin-on-end. |
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po, yes, or like when you spin on a revolving chair with your legs out then draw them in. |
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doesn't sound very ladylike ;) |
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I don't see how zero-G will help you test this. As boysparks suggests, what you need to explore is zero-friction conditions - spin the egg on rough and smooth surfaces, and see how the effect varies. |
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You could even make a magnetic egg and spin it on a bed of air, to test near-frictionless conditions. |
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Testing the friction idea on the kitchen table? That's so very...down to earth.
I just had a thought, and I don't have a handy hard-boiled egg: does the egg always spin up onto the same end? Is it related to whether it is spun clockwise or anti-clockwise? |
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That's a similar explanation as with the mathematical proof. |
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I tried to think of it this way:
The egg initially spins around one axis. As it does so, the shape of the egg causes the egg to start to rotate around its axis of symmetry: it tries to roll.
As the roll speed increases, the egg experiences a gyroscopic effect because the high roll speed is being asked to spin around a different axis.
This generates a precessional force which tilts the egg to the vertical orientation. |
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So, the role of friction is indirect, because it makes the egg roll. But the roll generates the gyroscopic force to tilt the egg. |
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The precessional model should make the egg stand on its pointy end. Anyone with an egg? |
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I always preferred Christopher Columbus' method for getting an egg to stand on its end. |
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my dad had a solution too but then it had been hard-boiled first. |
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Why did the egg roll?
Because it saw the apple turnover. |
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The banana split, the jelly rolled, and it became immediately apparent that the cereal was just a bunch of flakes. |
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