physics - the scientific study of matter and energy and how they interact with each other. It depends on observation and experiments., energy - the strength and vitality required for sustained physical or mental activity., mechanics - the branch of applied mathematics dealing with motion and forces producing motion., optics - the branch of physics that deals with propagation, behavior and properties of light., atomic physics - studies structure of atom, phenomena at atomic scale and the interactions between atoms and molecules., high energy physics - investigates elementary particles of matter and their interactions both theoretically and experimentally,

physics

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