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美国研究人员新近发现了一种以前不为人知的、能在短距离内微弱地抵消重力的基本力。这种特殊力能使羽毛在没有空气阻力的情况下,向地面下落的速度比金属币还快。科学家们把这种力称为超负载力。他们认为,在真空中从同样高度下落时羽毛之所以比金属币落得快,是因为对物体起作用的不仅是重力,另外还有一种力,这种力与两个物体之间的引力方向相反,它使不同结构和质量的物体产生稍微不同的加速度。眼下人们公认的四种力是:重力、电磁力及叫做强力和弱力的两种次原子力。超负载力被称为第五种力。
American researchers have recently discovered an underlying force that was previously unknown and weakly counteracting gravity over short distances. This special force enables the feathers to drop to the ground faster than metal coins without air resistance. Scientists call this force an overloaded force. They think the reason why feathers fall faster than metal coins when they fall from the same height in a vacuum is that not only gravity but also a force acting opposite the object is opposite to the direction of gravity between the two objects , Which gives slightly different accelerations to objects of different structures and masses. Right now people recognize the four forces are: gravity, electromagnetic force and called the two sub-atomic forces of strength and weakness. Overload is called the fifth force.