Hydraulic Engine: Ball Spin, Stop & Why?

  • Context: High School 
  • Thread starter Thread starter adska
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    Engine Hydraulic
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Discussion Overview

The discussion revolves around the behavior of a metal ball in a hydraulic engine setup, specifically focusing on whether the ball will spin, the conditions under which it might spin, and the factors that would lead to it stopping. The scope includes conceptual understanding and exploratory reasoning related to fluid dynamics and forces acting on the ball.

Discussion Character

  • Exploratory, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant questions whether the ball will spin, expressing uncertainty about the physics involved.
  • Another participant asserts that if the ball, air, and oil are initially stationary, the ball will not start spinning suddenly.
  • A later reply suggests that the ball could start spinning if air is pressed through a valve, indicating a potential mechanism for motion.
  • It is proposed that the ball would stop spinning due to viscous drag forces acting on it.
  • Concerns are raised about the pressure dynamics in the sealed container, questioning why air would flow past the ball if the pressures are similar.

Areas of Agreement / Disagreement

Participants express differing views on the conditions necessary for the ball to spin, with some asserting it will not spin unless certain conditions are met, while others propose mechanisms that could lead to spinning. The discussion remains unresolved regarding the exact behavior of the ball.

Contextual Notes

There are limitations related to the assumptions about the initial state of the system, the definitions of forces involved, and the implications of pressure dynamics within the sealed container.

adska
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What will happen with metal ball in the below picture? it will spin? if yes, when it will stop and why? I am not very faimiliar with physics, but I am sure that ball must spin :D

http://www.cagof.com/Untitled.png
 
Last edited by a moderator:
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If the ball, air, and oil are all initially stationary then it will not suddenly start to spin.

Please be aware of the forum rules prohibiting discussion of perpetual motion machines.
 
Dale said:
If the ball, air, and oil are all initially stationary then it will not suddenly start to spin.

Please be aware of the forum rules prohibiting discussion of perpetual motion machines.

air will be pressed through valve
 
Then it could start spinning. It would stop spinning when viscous drag forces stop it.
 
The container appears sealed at the bottom so the pressure in the oil is likely to be the same/similar to that of the air - so why would the air go past the ball?
 

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