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RichardKennaway comments on Rationality Quotes May 2014 - Less Wrong
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"Because of gravity" isn't any better an explanation than "because they are heavy". Why does "gravity" accelerate all masses the same? Really thinking about that leads to general relativity, so it actually takes many years to explain why things fall, and it can't be done without going through calculus, topology, and differential geometry.
Cf. Feynman on explanations (07:10–09:05).
Just being able to recite "because of gravity" is not enough for many purposes. I myself did well in physics at school and finished best in class in it but I haven't studied any physics since then and I'm well aware that I don't understand advanced physics.
It's not perfect but it is better. Airplanes fly well based on Newtonian physics.