How does 8 yo know about F=ma? is he reading physics books?
Taught 8 yo about F = ma by showing how a soccer player could run faster if he lost weight. That really brought it home.
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Might have found a better way to teach that lesson that did not involve "losing weight".
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Awesome example
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meh, next time use a water rocket and add payload mass. Nice side effect: a rocket has no const m so u hav reason to teach integrals too :D
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Football*
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but this doesn't work so well when the object (human) has to generate the force; if you weigh too little, will be weak
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not like kicking a ball
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Friction. We don't talk enough about friction, without which we'd run at arbitrary speeds.
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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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