@physicsfun 2022-08-07 22:21:48
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The PiTOP: this beautiful brass cylinder has a radius of 1 inch, a height of 1/π inches, and displays the first 109 digits of π on its face. Spin this disk (best with sound on) and it will demonstrate some very interesting physics involving energy transfer and conservation of angular momentum. The edges of the cylinder are rounded and engineered to exhibit an optimum motion of a “spolling” coin, a motion that combines spinning and rolling (closeup shown in 240fps). As the disk’s angle of inclination decreases the speed of the rolling increases dramatically until the contact point with the mirror is moving in excess of 200mph. From the mind of physicist Ken Brecher, inventor of the PhiTOP and other math constant spin tops. Note also that with the specified height, that the volume of this cylinder is exactly 1 cubic inch! ➡️ Follow the link in my profile for info on where buy a PiTOP and other amazing items featured here on

@physicsfun at 2022-08-07 22:21:48

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