As diferentes formas do conhecimento científico ao longo do tempo têm sido construídas a partir de princípios, ou seja, ideias inicialmente postuladas e posteriormente validadas. Na física, existem muitos princípios, como o da conservação da energia, o da quantidade de movimento e (talvez, de maior alcance) o da relatividade.
Adilson de Oliveira
Departamento de Física,
Universidade Federal de São Carlos (SP)
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