Question concerning kinetic energy and potential energy

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When a stretched spring is released, its potential energy converts to kinetic energy as it oscillates. Eventually, the spring comes to rest, resulting in both kinetic and potential energy equaling zero. The energy is transformed into heat due to non-conservative forces like friction, which disrupts the organized movement of particles. This disorganization leads to energy being radiated, convected, or conducted away from the spring. Thus, the energy is not lost but rather transferred to the surroundings as heat.
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Suppose that I start with a stretched, stationary spring, so there's a high potential energy, but no kinetic energy.

Then I release the spring, so the potential energy is converted to kinetic energy as the spring collapses and oscillates.

After some time t, the spring stops moving and comes to a rest, so kinetic energy = 0, and potential energy also = 0, so where did all the energy go? If it's released as heat, how exactly does it do that?
 
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A perfect spring wouldn't ever stop moving unless it lost its energy to a non conservative force. So yea, it the energy gets sucked up by heat,friction,etc.
 
Everything becomes heat due to the molecule constructs not being able to transfer kinetic energy perfectly, and thus disorganizing the movements between the particles, and as we all know heat is just disorganized movement on particle level.
 
That heat is eventually radiated, convected, and/or conducted away from the spring into the surroundings, so that is the mechanism whereby it is removed from your spring.
 

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