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# Section01 - Physics 204A Class Notes Section 1 An...

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Physics 204A Class Notes 1-1 Section 1 – An Introduction to Physics 204A Section Outline 1. A Preview of Physics 2. A Preview of Phys 204A 3. The Scientific Method a. Observation b. Theory c. Prediction d. Experiment 4. Coordinate Systems 1. A Preview of Physics Physics tries to answer the same question every human has asked since the dawn of mankind: Why are we here? Physicists break this question down into two parts: What is the universe made of? Here is what we know: How do the parts interact? This is the topic we’ll begin to investigate in this class. The Four Fundamental Interactions Interaction Strength Example Gravitational 1 Solar System Electromagnetic 10 36 Hydrogen Atom Weak Nuclear 10 25 Beta Decay Strong Nuclear 10 38 Nuclear Stability Quarks neutrons and protons are made of quarks Leptons the electron is one type of lepton Matter (5%) Nearly all the stuff in our corner of the universe Dark Matter Causes stars on the outer edge of galaxies to rotate faster Dark Energy Causes the universe to expand at an ever increasing rate Universre

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Physics 204A Class Notes 1-2 Classical Mechanics Translation The motion of objects as a whole Rotation The spinning motion of objects Energy Momentum Force Kinematics Energy Angular Momentum Torque Kinematics 2. A Preview of Physics 204A How do the parts interact? A better way to ask the question is: What do objects do and why do they do it? These are the central questions of the study of Classical Mechanics. Kinematics describes what objects do. That is to say, kinematics describes motion. Interactions explain why objects do what they do. Interactions are described in terms of forces, torques, energy, momentum and angular momentum. During our study this semester, we will discover seven and only seven fundamental laws of physics: Newton's Laws of Motion explain the concept of force. 1. Newton's First Law - The Law of Inertia 2. Newton's Second Law - F=ma 3. Newton's Third Law - The Law of Action/Reaction Conservation Laws 4. Conservation of Energy 5. Conservation of Linear Momentum 6. Conservation of Angular Momentum
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