Pendulum Equilibrium: Can It Pass Balance Point Twice?

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Discussion Overview

The discussion revolves around the behavior of a pendulum at its balance point, specifically whether it can be released from a certain height and initial condition such that it does not pass the balance point on its first swing but does so on its return. The inquiry explores theoretical aspects of pendulum motion without considering external factors like air resistance or friction.

Discussion Character

  • Exploratory, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant proposes the scenario of a pendulum swinging in a spherical path and questions the possibility of it not passing the balance point on the first swing but doing so on the return.
  • Another participant expresses belief in the possibility of this scenario but admits to lacking proof and seeks guidance or a solution.
  • A further participant agrees with the possibility and inquires about the method to achieve this condition, as well as the implications for a time-reversed process.

Areas of Agreement / Disagreement

Participants generally agree that the scenario is possible, but there is no consensus on the specific initial conditions or height required to achieve this outcome. The discussion remains unresolved regarding the proof or demonstration of the claim.

Contextual Notes

The discussion does not provide specific mathematical formulations or detailed conditions that would clarify the initial setup or the mechanics involved in the pendulum's motion.

walter1998
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Consider a pendulum in it's balance point hanging from ceiling. It can swing in all the directions in the space. The pendulum can only swing in a sphere(the string can't bend). Now, is it possible to release the pendulum in a particular height and with a initial condition that in the first go(the same height as the first place) it doesn't pass the balance point but in the return it does? (don't count air or friction)
If it is possible what initial conditions and height(s) are required?
If not why?
 
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What do you think?
 
mfb said:
What do you think?
I think it is possible but i cannot prove it; I'd be glad if you could guide me or more glad if you solve it.
 
walter1998 said:
I think it is possible
In which way?

Also, how would the time-reversed process look like?

What do you know about angular momentum?
 

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