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Transcript

AP Physics Physics – the study of matter, interaction and change. (Really its all about the energy!) Law and Theory • A law is a description of nature that manifests itself in recurring patterns of events. – The law of conservation of matter and energy. • A theory elucidates (gives a clarifying explanation) law and explains phenomena. – The theory of evolution. Classic and Modern Physics • Everything developed up until the 1920-’s is labeled as classical. It includes Newtonian Mechanics, Thermodynamics, and Electromagnetic theory. Einstein completed the pillars of classic physics with his theory of relativity (special and general). The universe grinds along in a certain way. • When Einstein postulated that light is particulate and new theoretical approach called Quantum Physics began to develop. Modern physics studies the handful of atomic particles (quarks, leptons and photons) that compose the entire universe. Quantum Physics understands the universe but nothing is certain. Four Fundamental Forces • Gravity – weakest, always attractive and not selective and infinite • Electromagnetic force – short range atomic interactions which is infinite, attractive and repulsive and gives rise to most contact forces. • Strong Force – binds the quarks together to form neutrons, protons and to form the nucleus • Weak Force – turns quarks from one type to another and change neutrons to protons. Thermonuclear fusion is due to the weak force. Symmetry • Nature is symmetrical • Theories are developed based on that symmetry • The infant Universe was symmetrical and uncomplicated and has since shattered into complexity as it has cooled. MKS • Length – always measured in meters. • Mass – always measured in kilograms. • Time – always measured in seconds. • Mass is the quantity of matter and is a fundamental quantity. • Weight is the force a mass exerts based on the gravitational acceleration at its location. Online Help • Learnerstv.com – Physics • Classical Mechanics – Prof Lewin