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Interesting thing number one: the gravitational force pulling the object downwards depends on its mass, the mass of the attracting body (the Earth) and the distance between them (mathematically, the square of this distance, but let’s not worry about that). So, a more massive object – not bigger, I really mean something with more mass – ‘feels’ more gravitational attraction and the net result is the same acceleration.4 That’s why it shouldn’t matter whether you accidentally dropped a cup, a plate, a bowling ball or a feather.其中蕴含的有趣道理，第一点：吸引物体向下的重力作用，取决于物体自身的质量、吸引体（如地球）的质量及两者之间的距离（在数学上，这个距离的平方也会影响重力的大小，但此刻无需深入探讨）。因此，质量越大的物体（这里强调的是质量，而不是体积）无疑会“感受到”更多的重力吸引，但物体下落时的加速度相同。4这也正是为什么，无论您不小心掉落的是杯子、盘子、保龄球，还是羽毛，物体下落的速度和方式是相同的。
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