Marble Twister: centripetal acceleration keeps the marble on the rails of the coil in this vintage vortex shaped marble run toy. Not enough velocity to keep it all the way down though so it drops down at a certain point. ➡️ Follow the link in my profile for more info on where to find this and other amazing items featured here on @physicsfun #physicstoy #gravitywell #angularmomentum #kineticart #marblerun | Physicsfun