Newton’s laws

The opening sentence of a recent piece by Laura Spinney in The Guardian:

Isaac Newton apocryphally discovered his second law – the one about gravity – after an apple fell on his head.

Newton’s second law of motion is F = ma. His gravity law – that of universal gravitation – is Fgr = G(m1m2)/R2.

This confusion isn’t a big deal by itself. But as an introduction to a popular science piece, it doesn’t look good at all.

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