![]() ![]() It is good to learn complex things by starting with huge assumptions that get us a reasonable answer with our limited understanding. This very simplified idea of how the world works is called a “First order approximation.” First order approximations can get you a long way, I suspect a lot of them got us to the Moon with a slide rule. These rules can answer a lot of questions by using some pretty big simplifications like “This object is perfectly rigid”, “There is no friction” or ‘Let’s pretend this non-spherical thing is spherical.” These simplifying assumptions allow us to ignore many complexities of the world and get something done. ![]() What he meant by this is there are some basic rules of physics that describe our world pretty well. With each class, we lie to you less and less.” Early on, one of the professors said to us that “The professors are all lying to you.
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