Taught 8 yo about F = ma by showing how a soccer player could run faster if he lost weight. That really brought it home.
Newton's laws are tremendously subtle. Took me nearly a decade to realize that they're misnumbered: the second and third should be switched.
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And the first law really is absolutely essential and conceptually primitive -- without it, the second and third laws would be meaningless.
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But perhaps the most interesting point is that the first law makes sense only once the principles of projective geometry do.
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