Equipment:
Theory: An object whose center of mass is below the point of suspension is in stable equilibrium. At rest, the center of mass is located directly below the suspension point. Displaced from rest, the object will oscillate about the equilibrium position.
Description: The bird's beak rests on a stand, entirely supporting it. The trick is the weights which have been added at the wingtips.
Setup time: 1 minute.
References: (available in the demo room)