Does a Pendulum Ever Stop Moving?

[Mk]

I hang an American flag sideways, with the staff being horizontal, and blow on it. It will swing, but will it ever stop? It being a pendulum, I mean, when does the pendulum ever stop moving if it does? Complete vacuum.

 

[FredGarvin]

The fibers/threads in the flag will eventually produce enough friction to dampen out the movements.

 

[disregardthat]

If there were no friction at all, would the pendulum swing forever?

 

[russ_watters]

Yes.

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