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A linear back-and-forth motion from purely rotational motion. This is the Tusi couple, a geometric mechanism introduced by the Iranian scholar Nasir Tusi in the 13th century. 🎥 marmarjoon

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Dreams N Science

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This video looks like a rotating wheel. But watch just one single sphere. It never rotates. Every ball only moves in a perfectly straight line back and forth. This is simple harmonic motion where linear position follows: x = R cos(ωt) By perfectly offsetting the timing of each straight path, the collective motion creates the illusion of rotation.

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