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Physics

Physics . What is Physics?. What do you think of when you hear the word “physics”? What does “physics” mean to you?. What is Physics? .

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Physics

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  1. Physics

  2. What is Physics? • What do you think of when you hear the word “physics”? • What does “physics” mean to you?

  3. What is Physics? • Per Oxford Dictionary: “the branch of science concerned with the nature and properties of matter and energy. The subject matter of physics, distinguished from that of chemistry and biology, includes mechanics, heat, light and other radiation, sound, electricity, magnetism, and the structure of atoms”

  4. What is Physics? • Take the dictionary definition and put it into your own words.

  5. History of Physics • Originally known as the study of “natural philosophy” • Oldest and most pure science – matter and energy is the basis for all other sciences • Can be divided into two categories: classical physics and modern physics.

  6. Classical Physics • Used in everyday life • Primarily taught in junior high and high school

  7. Modern Physics • Explains phenomena that classic physics cannot explain • For example, situations in which extremely small masses or very high speeds are involved

  8. Contributors to Physics • 4th Century BC – Aristotle developed first treatise of physics • 3rd Century BC- Archimedes observed that a solid submerged in a liquid loses weight equal to the weight of the liquid displaced

  9. Contributors cont. • 15th Century- Leonardo da Vinci designs for parachute and flying machines • 16th Century-Nicolaus Copernicus – heliocentric theory

  10. Contributors cont. • Galileo Galilei- study of moving bodies in space • William Gilbert-study of magnetism and electricity

  11. Contributors cont. • Rene Descartes – concept of inertia • Sir Isaac Newton – three laws of motion

  12. Sir Isaac Newton • Background • Born 1643 (D 1727) and wasn’t expected to survive • Raised by maternal grandmother • Became a professor and lectured about optics using a reflecting microscope he designed • Published Mathematical Principals of Natural Philosophy in 1687 • 1) A stationary body will stay stationary unless an external force is applied to it • 2) Force is equal to mass times acceleration, and a change in motion is proportional to the force applied • 3) For every action, there is an equal and opposite reaction.

  13. Book investigation • Let’s begin by defining a few key terms in physics. • Using your textbook, define and illustrate the following terms in your lab notebook: • Newton -Speed • Force -Velocity • Gravity -Acceleration • Mass • Weight -Inertia • Momentum -First law of motion

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