Bob thinks

The swinging Pendulum continues swinging (and the time moves on).. the bob is heavy (why?).. it runs left to right and right to left.. its tired of running.. it wants to break free.. but the string restraints it.. so it continues to run.. what is its equillibrium? to get back to its mean position.. or to snap itself off, from the string? the bob has to make a choice.. i have made mine...