Intro to PhysicsMrs. Coyle Physics is the study of the physical world including motion, energy, light, electricity, magnetism, sound etc.
Physics Golden Gate Bridge • Mechanics • Kinematics (motion) • Statics, Dynamics (forces) • Electricity • Magnetism • Waves • Optics (geometric optics) • Nuclear Physics (Modern Physics)
Physics • The most basic science. • The foundation of other sciences • What? • Why? • How? • When?
Aristotle (Greek 4th Century BC) • Logic • Studied motion • Natural and violent motion • 4 elements: earth, water, air, fire • Geocentric view • Aristarchos(310-230 BC), disagreed and believed in heliocentric view.
Democritus • Greek who devised the first atomic theory.
Galileo Galilei (1564 AD) • Father of the scientific method (along with the Englishman Francis Bacon 1500’s). • Studied motion. • Agreed with the Greek Aristarchos and Polish Copernicus (1473-1543) on heliocentric view point. This lead to his house arrest.
Isaac Newton • English(1642-1727) related force and motion and studied light.
A Glance at Some Scientists who Studied Electricity and Magnetism • American Benjamin Franklin (1706-1790), experimented with electricity. • Michael Faraday (1791-1867), English with a grammar school education, found that a moving magnet induces electric current to flow.
The BIG Guy • Albert Einstein (1879-1955) • Relativity: there is no absolute frame of reference that is at rest. • Photoelectric effect (Light is quantized) (Nobel Prize) • Related mass and energy E=mc2
The Scientific Method • Steps followed during scientific investigations.
Scientific Method • Recognize a problem • Hypothesis- educated guess, testable • When tested and confirmed becomes a law • Observation -measurement, data collection (experiment) • Theory – information including tested hypothesis • Conclusion
Law or Principle • A hypothesis that has been repeatedly tested and not contradicted. • Laws change or are abandoned when contradicted.
Scientific Fact • Observation • May change
Science and Technology • Science Pure • Technology Applied
Math and Units • Math- the language of Physics • Units SI – International System • Basic Units MKS • Meter m • Mass kg • Time s • National Bureau of Standards • Prefixes