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Inertial prop of object

  1. Apr 20, 2010 #1
    Does only 'mass' as a prop. of an object responsible for resistance to change in motion?
  2. jcsd
  3. Apr 22, 2010 #2
    Yes. If you are in a vacuum.
  4. Apr 23, 2010 #3
    Only if the object is uncharged. If the object has an excess electric charge of either sign, then in addition to the "inertial reaction force" (object's resistance to acceleration), there will be a "radiation reaction force." For example, it takes a greater force to accelerate a 1 kg particle with an excess charge of 1 coulomb, than it takes to give the same acceleration to a 1 kg particle with zero excess charge. The additional power expended in the charged case flows out into the particle's electromagnetic field in the form of electric and magnetic field energy.
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