Where Does Absorbed Kinetic Energy Go?

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Discussion Overview

The discussion revolves around the fate of kinetic energy when it is absorbed by an object, exploring the transformations that occur during this process. Participants examine theoretical and conceptual aspects of energy transformation, particularly in the context of collisions and impacts.

Discussion Character

  • Exploratory
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • Some participants propose that absorbed kinetic energy may transform into deformation or potential energy.
  • Others express uncertainty about the concept of kinetic energy being "absorbed," emphasizing that kinetic energy is inherently related to movement.
  • A participant illustrates a scenario involving a boulder impacting marshmallows, questioning what happens to the kinetic energy in such a case.
  • Some suggest that absorbed kinetic energy could be converted into a combination of deformation, potential energy, internal energy (random motion of molecules), and possibly sound energy.
  • A later reply acknowledges a previous explanation as satisfactory, indicating that the description resonated with their understanding.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the precise nature of absorbed kinetic energy, with multiple competing views on what transformations occur and whether potential energy is involved.

Contextual Notes

The discussion includes varying interpretations of kinetic energy absorption, with some assumptions about the definitions of energy types remaining unaddressed. The scope of energy transformations in different contexts is also not fully resolved.

tpluss
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We all know the theory that energy never dies, that it is only transformed into a different type of energy.
Well, I was wondering, when kinetic energy is absorbed by an item, what happens to the energy? If the kinetic energy is not transferred to the object, but absorbed, then where does the energy go?
 
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deformation or potential energy
 
I'm not sure what you mean by kinetic energy being "absorbed". Kinetic energy is the energy of movement.
 
Snazzy said:
I'm not sure what you mean by kinetic energy being "absorbed". Kinetic energy is the energy of movement.

If an item that has kinetic energy impacts something with no kinetic energy and the item that is impacted does not move, then the kinetic energy is absorbed.

In other words: If a boulder is falling off of a cliff and it hits a gigantic mass of marshmallows, the marshmallows would absorb the boulder's remaining kinetic energy causing the boulder to stop.

So tell me, what happened to that absorbed kinetic energy?
I do not think it becomes potential energy because potential energy is characterized by how much an object is prone to have kinetic energy (or how much an object is prone to fall down).
 
The macroscopic KE will be transformed into a combination of deformation, potential energy, and internal energy (random motion of the molecules). (And maybe even a bit of sound energy.)
 
Doc Al said:
The macroscopic KE will be transformed into a combination of deformation, potential energy, and internal energy (random motion of the molecules). (And maybe even a bit of sound energy.)

That was a really good description, I think that answers my question well enough. :D
 

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