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Leonardo da Vinci is usually credited with conducting the first systematic study of friction in the late 15th century, a subfield now known as tribology that deals with the dynamics of interacting surfaces in relative motion. Da Vinci's notebooks depict how he pulled rows of blocks using weights and pulleys, an approach that is still used in frictional studies today, as well as examining the friction produced in screw threads, wheels, and axles. The authors of this latest paper used an experimental setup similar to da Vinci's.
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18:57, 27 февраля 2026Культура
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Мощный удар Израиля по Ирану попал на видео09:41。WPS下载最新地址是该领域的重要参考
（四）亵渎、否定英雄烈士事迹和精神，或者制作、传播、散布宣扬、美化侵略战争、侵略行为的言论或者图片、音视频等物品，扰乱公共秩序的；