English: Graph of the potential energy of a conservative bistable system. There are two local minima of the potential energy at x1 and x2 which are stable equilibrium points at which the red object can rest. Between them is a local maximum of energy x3 which is an unstable equilibrium point. If the red object is placed there it is in equilibrium but unstable; the slightest disturbance will cause it to move to one of the stable equilibrium points
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Captions
Graph of the potential energy of a bistable system