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In introductory mechanics, the momentum of a particle is its mass times its velocity. In electrodynamics, the momentum of a field is proportional to the cross-product of the electric field with the magnetic field. In special relativity, momentum is generalized to four-momentum.

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What is happening on an atomic level (or lower) when a object is in motion (inertia)?

It is understood that however much force was applied to the object before "take off" will be "contained" or held by the object until other forces (such as gravity and air resistance) oppose the momentum
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