阿基米德(约公元前287～前212)是古希腊物理学家和数学家。他发现了杠杆原理——即杠杆的平衡条件:动力(F1)×动力臂(l1)=阻力(F2)×阻力臂(l2)运用这一原理,他曾经设计过杠杆滑轮系统,创造了用小力把大船拉到水里的奇迹。他为了说明杠杆的威力,曾经说过:“给我一根足够长的杠杆,我能用它撬起地球来。” Archimedes (circa 287-BC BC) was an ancient Greek physicist and mathematician. He discovered the principle of leverage—that is, the balance condition of the lever: power (F1)×power arm (l1)=resistance (F2)×drag arm (l2). This principle was used. He had designed the lever pulley system and created it. Xiaoli pulls the big ship into the miracle of the water. In order to illustrate the power of leverage, he once said: “Give me a long enough lever to use it to pick up the earth.”