Ideal Entities in Physics: Exploring Massless Springs and Friction-Free Slopes

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In summary, ideal entities are conceptual or abstract ideas used as a standard or model for comparison. They are used in science to explain complex concepts and cannot be proven or measured due to their lack of physical existence. The objectivity of ideal entities depends on the context, and they may change over time and vary among different cultures and perspectives.
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In this thread mgb listed massless springs and friction free slopes. That made me think - what other idealized entities (not sure of that's the best selection of word, feel free to correct/edit) do we use in physics? Other things that I can think of just off the top of my head are point masses, massless strings and rods, ideally elastic strings, ideal black body, zero internal resistance batteries.

Your favorite?
 
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Containers with zero heat capacity
Pendulums that actually perform SHM (the theta = sine theta trick!)
Ideal gasses
"Thin" lenses shown as having no thickness in ray diagrams
 

1. What are ideal entities?

Ideal entities are conceptual or abstract ideas that represent the perfect or most desirable version of something. They do not physically exist in the world, but are used as a standard or model for comparison.

2. How are ideal entities used in science?

Ideal entities are used in science to help explain and understand complex concepts and phenomena. They serve as a theoretical framework for scientists to develop hypotheses and conduct experiments.

3. Can ideal entities be proven or measured?

No, ideal entities cannot be proven or measured because they do not have physical existence. They are abstract concepts and therefore cannot be observed or quantified.

4. Are ideal entities subjective or objective?

It depends on the context in which they are used. In science, ideal entities are usually considered objective because they are based on logical reasoning and evidence. However, in other fields such as philosophy or art, they may be more subjective.

5. Do ideal entities change over time?

Yes, ideal entities can change over time as our understanding and knowledge of the world evolves. They may also vary among different cultures and perspectives.

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