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.
设立5年过渡期，有效推动巩固拓展脱贫攻坚成果同乡村振兴有效衔接。推动脱贫产业可持续发展，巩固脱贫人口义务教育、基本医疗、住房安全和饮水安全保障水平，2021年至2025年，脱贫县农村居民人均可支配收入增速连续5年高于全国农民平均水平。
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