What is Force or Interaction ?

Looking at an Electron in Detail

When another electron nearby the first takes a juggled photon away, the momenta of the two electrons change by the amount that the exchanged photon had.

Vertices that Govern Fundamental Forces

Apparent strength of a force and the mass (M) of the corresponding force carrying particle

• M: small -> force particles fly long distance
  
• M=0 -> force particles fly infinite distance (long-distance force)
  
• M: large -> force particles fall short (short-distance force)
  

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