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应用KPK力学方法研究落体的运动

Analysis on the falling motion with KPK mechanics method
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摘要 利用动量流强度,分析了在阻尼介质中的物体包括高空跳伞运动员的运动规律。首先介绍了德国卡尔斯鲁厄物理教程的力学体系,该体系将动量和速度定为力学的中心物理量,根据力的定义式与电流的定义式的类比把力看成动量流强度,利用动量的连续性方程来解决力学问题。接着运用卡尔斯鲁厄物理教程的力学方法计算了物体在空气中下落时速度变化规律,继而定性地分析了具有水平运动速度的高空跳伞运动员在达到第一收尾速率之前会有一个极小速率的原因,说明卡尔斯鲁厄物理教程的力学体系解决力学问题不仅是可行的,而且是有效的,更能让人们在新的高度认识物理学。 Making use of the concept momentum current intensity,the motion of objects including the falling of skydivers in damping medium was analyzed.The mechanics system of Der Karlsruher Physikkurs was introduced,where momentum and velocity were regarded as the central physical quantities.According to the definition analogy between force and current,the force was regarded as the momentum current strength.Mechanical problems was solved according to the continuity equation of momentum.The speed of the object falling in the air was calculated using this method and the reason for the existence of a minimum velocity for the skydiver with horizontal velocity before reaching the first closing speed was qualitatively analyzed.The study shows that the mechanics system of Der Karlsruher Physikkurs is not only feasible,but also effective.This can make people understand physics at a new height.
作者 皇甫泉生 严非男 顾铮 HUANGFU Quansheng;YAN Feinan;GU Zhengtian(College of Science,University of Shanghai for Science and Technology,Shanghai 200093,China)
出处 《上海理工大学学报》 CAS CSCD 北大核心 2020年第6期612-616,共5页 Journal of University of Shanghai For Science and Technology
基金 上海理工大学2020年度院级教师教学发展研究项目(lxyjy05)。
关键词 卡尔斯鲁厄物理课程(KPK) 类比 动量流强度 连续性方程 收尾速度 Der Karlsruher Physikkurs(KPK) analogy momentum current strength continuity equation closing speed
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