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Newton's third law and attraction

  1. Nov 29, 2014 #1
    Is the force of attraction between an electron and a proton in a hydrogen atom a example of action and reaction to which newton's 3rd law applies?
  2. jcsd
  3. Nov 29, 2014 #2
    Yes it is.
  4. Nov 29, 2014 #3
    Tks. :D Is it the same as the centripetal force keeping a satellite in orbit and its weight?
  5. Nov 29, 2014 #4
    Principle action=reaction always applies. Electron motion (orbits) in a hydrogen atom must be quantized however. Classical mechanics isn't enough
  6. Nov 29, 2014 #5


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    I would say the concept of force is a bit moot at this scale.
  7. Nov 29, 2014 #6


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    The centripetal force keeping a satellite in orbit is its weight. The third law partner of this is the force with which the satellite pulls on the earth, keeping the earth in its orbit about the satellite.
  8. Nov 29, 2014 #7
    It doesn't apply to fictitious forces.
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