250 years is a long time. Hundreds of great scientists have lived and died in that time, thousands of new pieces of mathematics came into being, there were entire revolutions in the way we think about things like photons and atoms. Teaching a physics course but skipping 250 years of physics is like teaching biology without modernized evolutionary theories or even an idea of DNA, or history without quite a few presidents and both world wars. The biggest issue people seem to have is that they find this new stuff daunting. Physics is supposed to be hard, thats how culture thinks of it, so why try teaching students about quarks when they struggle with calculating velocity. But physics doesn't have to be hard, and its certainly not impossible to teach to high school students. Look at myself. I have only ever taken that lone class with a high focus on kinematics. All my knowledge comes from haphazard scanning of data and articles on the web, imagine what an actual class might accomplish?
That's one of the biggest problems we have. Kids today who take a high school physics course and roll out to college with the intention of solving kinematics equations, only to find this intense language of maths and calculus beyond their grasp. Why? Because high school physics does an awful job showing what real physics is. Newtonian models, the "big stuff" math has been set aside today for Quantum World to be examined, and considering practically no high school classes go into any depth on that subject, there lies an obvious problem.
The video below is from a group of physicists in the UK who are discussing how physics classes in the UK are taught to students. The system across the pond is almost identical to ours, and these educated men find humor in their old notes from these classes.
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