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| ===== The Three Fundamental Principles of Mechanics ===== | ===== The Three Fundamental Principles of Mechanics ===== |
| A major focus of introductory mechanics is understanding three fundamental principles of how objects interact (though they may have been called by different names): [[183_notes:momentum_principle|the momentum principle]], [[183_notes:define_energy#the_first_law_of_thermodynamics_the_energy_principle|the energy principle]], and [[183_notes:l_principle|the angular momentum principle]]. These principles are central to the study of physics broadly, not simply mechanics; they are [[183_notes:fundamental_principles|deep truths about our universe]], which seem to hold in every observation we make and experiment we conduct. | A major focus of introductory mechanics is understanding three fundamental principles of how objects interact (though they may have been called by different names): [[183_notes:momentum_principle|the momentum principle]], [[183_notes:define_energy#the_first_law_of_thermodynamics_the_energy_principle|the energy principle]], and [[183_notes:l_principle|the angular momentum principle]]. These principles are central to the study of physics broadly, not simply mechanics; they are [[183_notes:fundamental_principles|deep truths about our universe]], which seem to hold in every observation we make and experiment we conduct. |
| As such, in Electricity & Magnetism (E&M for short), these fundamental principles do not change - we will still use these three principles. In addition, this semester we will add another deep principle [[https://en.wikipedia.org/wiki/Charge_conservation|(conservation of charge)]] and talk about two new types of interactions: the electric interaction and the magnetic interaction. As we talk about these new interactions and this new principle, we will be relying on the three fundamental principles to talk about how a system responds, so it is worth reviewing these principles and how they work. | As such, in Electricity & Magnetism (E&M for short), these fundamental principles do not change - we will still use these three principles. In addition, this semester we will add another deep principle [[https://en.wikipedia.org/wiki/Charge_conservation|(conservation of charge)]] and talk about two new types of interactions: the electric interaction and the magnetic interaction. As we talk about these new interactions and this new principle, we will be relying on the three fundamental principles to talk about how a system responds, so it is worth reviewing these principles and how they work. |
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| | ==== Lecture Video ==== |
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| | {{youtube>FuTw1sc6bL4?large}} |
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| ==== The Momentum Principle ==== | ==== The Momentum Principle ==== |