Wolfram Demonstrations Project

A mobile consisting of connected weights and massless rods is shown. Each mass

hanging from a lever arm

produces a net torque that contributes to the equilibrium configuration of the system.

The conditions of equilibrium are: for the sphere and the rest of the masses,

, for the cone and the masses at the bottom,

and the last,

Contributed by: Enrique Zeleny

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Equilibrium of a Suspended Mobile