The Double Ended Cone is a classic science park exhibit that demonstrates a fascinating illusion of physics: a double cone appears to roll "uphill" when placed on a diverging inclined track. In reality, the cone's center of gravity moves downward as it rolls toward the wider section of the track, obeying gravity even though it visually appears to defy it making this one of the most popular hands on demonstrations of center of mass and gravitational principles.
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