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Roman in Britain
Fundamental interactions , sometimes called fundamental forces or interactive forces , are described in fundamental physics as patterns of relations in physical systems evolving over time, whose descriptions appear not reducible to relations among entities more basic. The known fundamental interactions are gravitation , electromagnetism , strong nuclear , and weak nuclear which are all non-contact forces . The electromagnetic and weak interactions were modeled together as the electroweak interaction , inferred to operate only at such high temperatures as soon after the presumed Big Bang , although as the early universe cooled, the electroweak interaction split into electromagnetism and the weak interaction.