What conditions must be met so that free vibrations can occur in a system of bodies? Give examples.

1) the system has a stable equilibrium position; 2) the friction forces in the system must be small enough. In a mathematical pendulum, the position of stable equilibrium is the position of the thread when it is vertical. If during vibrations the friction at the suspension point and the air resistance are sufficiently small, then both conditions for the occurrence of free vibrations are satisfied.

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