Why does a pendulum move as if it has a mind of its own

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SUMMARY

The discussion centers on the behavior of a pendulum, particularly its transition from linear to circular motion. When released, a pendulum initially swings in a straight line but may begin to exhibit circular motion due to factors such as small movements in the mounting bracket or the use of a wound string, which can introduce torque. In contrast, a long pendulum with a rigid mount can display apparent motion influenced by the Earth's rotation, as demonstrated by the Foucault pendulum. These phenomena illustrate the complexities of pendulum dynamics in different settings.

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  • Understanding of basic physics concepts, particularly pendulum motion.
  • Familiarity with circular motion principles.
  • Knowledge of torque and its effects on motion.
  • Awareness of the Foucault pendulum and its implications in demonstrating Earth's rotation.
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abar45
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My teacher for Physics hns proposed an extra credit bonus if anyone could answer this question dealing with a pendulm. Why does the pendulm move as if it had a mind of its own. Refering to the circular motion the pendulm starts making after a couple seconds. When the pendulm is released to go in a back and forth motion (a straight line) it starts off straight but then starts to make a circular motion, usually counter clockwise. What is the reason in lamens terms for it's circular path. Please!
 
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In a Lab room pendulum such motion is due to small motions of the mounting bracket and/or non-uniformities of the mount. I suppose if you are using a wound string it could cause a torque that would add components of motion causing the circular motion.

Now if you have a very long pendulum mounted with a very ridged mounting you will be able to observe an apparent motion of the swing path caused by the the rotation of the Earth (http://www.phys.unsw.edu.au/PHYSICS_!/FOUCAULT_PENDULUM/foucault_pendulum.html" . This is not related to the circular motion you see in the lab.
 
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