用英文介绍伽利略比萨斜塔自由落体实验（100词左右）

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古希腊权威思想家亚里士多德（公元前384—322年）曾经断言：物体从高空落下的快慢同物体的重量成正比,重者下落快,轻者下落慢.比如说,十磅重的物体落下时要比一磅重的物体落下快十倍.1800多年来,人们都把这个错误论断当作真理而信守不移.直到16世纪,伽利略（公元1564—1642年）才发现了这一理论在逻辑上的矛盾.伽利略说,假如一块大石头以某种速度下降,那么,按照亚里士多德的论断,一块小些的石头就会以相应慢些的速度下降.要是我们把这两块石头捆在一起,那这块重量等于两块石头重量之和的新石头 ,将以何种速度下降呢?如果仍按亚里士多德的论断,势必得出截然相反的两个结论.一方面,新石头的下降速度应小于第一块大石头的下降速度,因为加上了一块以较慢速度下降的石头,会使第一块大石头下降的速度减缓；另一方面,新石头的下降速度又应大于第一块大石头的下降速度,因为把两块石头捆在一起,它的重量大于第一块大石头.这两个互相矛盾的结论不能同时成立,可见亚里士多德的论断是不合逻辑的.伽利略进而假定,物体下降速度与它的重量无关.如果两个物体受到的空气阻力相同,或将空气阻力略去不计,那么,两个重量不同的物体将以同样的速度下落,同时到达地面.
为了证明这一观点,1589年的一天,比萨大学青年数学讲师,年方25岁的伽利略,同他的辩论对手及许多人一道来到比萨斜塔.伽利略登上塔顶,将一个重100磅和一个重一磅的铁球同时抛下.在众目睽睽之下,两个铁球出人意料地差不多是平行地一齐落到地上.面对这个无情的实验,在场观看的人个个目瞪口呆,不知所措. Greek authorities thinker Aristotle (BC - 384 322 years) had affirmed: objects from falling with screw is proportional to the body's weight, the person that weigh whereabouts fast, light person whereabouts slowly. For example, ten pounds of falling objects than a pound of object dropped ten times faster. 18 years, people have the wrong judgment as truth and keep not move. Until the 16th century, Galileo (A.D. 1,564-1642) discovered the theory in logic contradiction. Galileo says, if a large stone in some speed decreases, then, according to the Aristotle's theory, a small stone will with corresponding slower speed drops. If we put the two stones bound together, that this weight is equal to the weight of the sum of the two stones new stone, what will be slower? If still presses Aristotle's assertion, certainly will draw opposite two conclusions. On the one hand, the new stone decreasing speed should be less than the first a large stone falling speed because added together with slower speed decreases stone, will make the first a large stone falling slows down, On the other hand, new stone falling speed and should be more than the first a large stone falling speed, because the two stones bound together, it weighs more than the first piece of rock. These two conflicting conclusions while not established, visible Aristotle's statement is illogical. Galileo and assume that object, speed and its weight down is irrelevant. If two objects by air resistance equal, or will air resistance, then, two omitting regardless of objects of different weights fall at the same speed will, and reach the ground. To prove the point, one day in the year 1589, pizza university young mathematical lecturer, year side 25-year-old Galileo, with his opponent and many people a debate to Pisa. Galileo boarded tower, put a heavy 100 pounds and a heavy one pound of iron ball also cast off. Under the eyes, two iron ball unexpectedly is almost parallel toghter fell down on the ground. Facing this relentless experiment, present watching people all gape, helpless.

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