In the special theory of relativity, four-force is a four-vector that replaces the classical force. == In special relativity == The four-force is defined as the rate of change in the four-momentum of a particle with respect to the particle's proper time.
In the special theory of relativity, four-force is a four-vector that replaces the classical force. == In special relativity == The four-force is defined as the rate of change in the four-momentum of a particle with respect to the particle's proper time.
Source: Wikipedia "Four-force" · CC BY-SA 4.0
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