Does a Pendulum Ever Stop Moving?

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Discussion Overview

The discussion revolves around the behavior of a pendulum, specifically whether it ever stops moving under various conditions, including the hypothetical scenario of a complete vacuum. Participants explore the effects of friction and other forces on the motion of a pendulum.

Discussion Character

  • Exploratory, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant describes an experiment with a flag hanging sideways and questions whether it will ever stop moving when blown, framing it as a pendulum scenario.
  • Another participant suggests that friction from the fibers of the flag will eventually dampen the movements, implying that the pendulum will stop.
  • A third participant poses a hypothetical question about the behavior of a pendulum in the absence of friction, asking if it would swing indefinitely.
  • A later reply asserts that, without any friction, the pendulum would indeed swing forever.

Areas of Agreement / Disagreement

Participants express differing views on the effects of friction on the pendulum's motion, with some suggesting it will eventually stop and others proposing that it could swing indefinitely under ideal conditions. The discussion remains unresolved regarding the implications of a complete vacuum.

Contextual Notes

The discussion does not clarify the specific definitions of friction or the conditions of the hypothetical vacuum, leaving assumptions about these factors open to interpretation.

Mk
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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.
 
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The fibers/threads in the flag will eventually produce enough friction to dampen out the movements.
 
If there were no friction at all, would the pendulum swing forever?
 

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