What is the meaning of interaction in science?

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Interaction in science refers to the influence between two masses, charges, or particles, which does not necessarily require physical contact. This concept encompasses various forces, such as gravitational, electric, and magnetic interactions. The essence of interaction lies in a two-way dependency, meaning that entities can affect each other regardless of distance. The notion of contact is complex and not a prerequisite for defining interaction. Understanding this broad definition is crucial for grasping the dynamics of scientific phenomena.
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when we say two masses or charges or particles interacts with each other, we have used the word interacts, what does that mean, does that mean a physical contact or something of that kind?
 
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It needn't be a contact. Interaction is a word for 'influence'.
 
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For example, there is a force between them - gravitational, electric, magnetic, etc.
 
You and me are interacting and you could be in China for all I know. There just needs to be a two-way dependency for there to be an interaction, no requirement that the dependency is based on contact.

Contact itself is a slippery notion.
 

Thread 'Reference frames, center of rotation, etc'

Topic about reference frames, center of rotation, postion of origin etc Comoving ref. frame is frame that is attached to moving object, does that mean, in that frame translation and rotation of object is zero, because origin and axes(x,y,z) are fixed to object? Is it same if you place origin of frame at object center of mass or at object tail? What type of comoving frame exist? What is lab frame? If we talk about center of rotation do we always need to specified from what frame we observe?
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