According to legend, the first experiment to show that all objects fell at the same rate, irrespective of mass, was performed by Galileo Galilei atop the Leaning Tower of Pisa. Any two objects dropped in a gravitational field, in the absence of (or neglecting) air resistance, will accelerate down to the ground at the same rate. This was later codified as part of Newton’s investigations into the matter. (Getty Images)

Scientists Admit, Embarrassingly, We Don’t Know How Strong The Force Of Gravity Is

Every physical theory has constants in it. The gravitational constant is remarkably uncertain.

Ethan Siegel
Sep 13, 2018 · 6 min read

When we first began formulating physical laws, we did so empirically: through experiments. Drop a ball off a tower, like Galileo may have done, and you can measure both…