Floating Hourglass Puzzle: famous physics puzzle- why does the hourglass not start rising right away? The glass only ascends after about half of the sand has transferred to the lower bulb. The hourglass is a normal glass timer, it is submersed in plain water, and the main tube has an inner diameter which is at least 2mm larger than the diameter of the glass. A simple physics property of the hourglass changes and explains this behavior. I'll post the answer in a few days. ANSWER: As the sand moves from top to bottom the center of mass of the glass changes. Initially the glass is top heavy and wedges against the walls of the cylinder where friction holds it down. Thanks for all the thoughtful and creative comments! ➡️ Follow the link in my profile for info on where to get a version of this physics puzzle and many of the amazing items featured here on @physicsfun #physics #physicstoy #physicspuzzle #puzzle #buoyancy #hourglass #float #gravity #torque #force #friction #science #scienceisawesome #floatinghourglass

A post shared by physicsfun (@physicsfun) on


Deixe uma Resposta

Preencha os seus detalhes abaixo ou clique num ícone para iniciar sessão:

Logótipo da WordPress.com

Está a comentar usando a sua conta WordPress.com Terminar Sessão / Alterar )

Imagem do Twitter

Está a comentar usando a sua conta Twitter Terminar Sessão / Alterar )

Facebook photo

Está a comentar usando a sua conta Facebook Terminar Sessão / Alterar )

Google+ photo

Está a comentar usando a sua conta Google+ Terminar Sessão / Alterar )

Connecting to %s