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Because it only appears to be rolling uphill--it is actually rolling downhill, as it must. The reason for the illusion is as the V-shaped grove the cone rolls widens the contact point on the cone are further from the center thus allowing the CG of the cone to lower as it rolls. Many so-called "Mystery Spots" (like the one in Santa Cruz, CA) use the technique using a ball rolling down a narrow groove that gets imperceptibly wider thus creating the illusion the ball is rolling uphill when it fact is not.

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Q: Why the double cone apparatus able to roll upwards?
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