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This tag is for the classical concept of forces, i.e. the quantities causing an acceleration of a body. It expands to the strong/electroweak force only insofar as they act comparable to ‘classical’ forces. Use the [particle-physics] tag for decay channels due to forces and [newtonian-mechanics] or one of the other subtopics of [classical-mechanics] for the dynamics of classical systems.
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Why are there only four fundamental interactions of nature?
Because that's the smallest number of laws we've been able to figure out to explain what we observe as well as possible.
Alternative: Physicists have been working for more than a century to reduce th …