1. Sep 3, 2013 #1

   manimaran1605

   

   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?

    

   manimaran1605, Sep 3, 2013
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3. Sep 3, 2013 #2

   dextercioby

   

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   It needn't be a contact. Interaction is a word for 'influence'.

    

   dextercioby, Sep 3, 2013
4. Sep 5, 2013 #3

   UltrafastPED

   

   Science Advisor

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   For example, there is a force between them - gravitational, electric, magnetic, etc.

    

   UltrafastPED, Sep 5, 2013
5. Sep 5, 2013 #4

   mikeph

   

   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.

    

   mikeph, Sep 5, 2013

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