Matter, energy, space, time and gravity

AI Thread Summary
Matter, energy, space, time, and gravity are distinct entities, each with unique properties, which is why they have different names. Their interactions form the foundation of physics. While matter can be perceived directly, energy, gravity, space, and time cannot be directly observed. The concept of Spacetime illustrates how space and time are interconnected and influenced by the presence of matter, which curves spacetime due to mass and energy. Understanding these distinctions and interactions is crucial for grasping the principles of physics.
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Are these five different things or are they just variations or properties of the same thing?
 
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They are different things (which is the reason why they have different names).
Their interaction is the topic of physics.
 
Matter is the only one of these that we can perceive directly. We cannot perceive energy, gravity, space or time directly.
 
We do not perceive matter directly, we perceive nothing directly.
 
Mathematical model that combines space and time is Spacetime that curves (gravity) in presence of matter (mass/energy).
 

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