OCR A Level Physics Laws and Principles

Archimedes' Principle The upthrust exerted on a body immersed in a fluid, whether fully or partially submerged, is equal to the weight of the fluid that the body displaces Chandrasekhar's limit The mass of a star's core beneath which the electron degeneracy pressure is sufficient to prevent gravitational collapse. 1.44 solar masses Conservation of charge Electric charge can neither be created nor destroyed - the total charge in any interaction must be the same before and after the interaction Cosmological principle The assumption that, when viewed on a large enough scale, the Universe is homogeneous and isotropic, and the laws of physics are universal Coulomb's law Any two point charges exert an electrostatic (electrical) force on each other that is directly proportional to the product of their charges and inversely proportional to the square of their separation