小汽车能否“拯救”濒临落崖的重卡  

CAN A SMALL CAR SAVE A HEAVY TRUCK FALLING OFF A CLIFF

作　　者：王永康 田展 陈奎孚[1] 常正 WANG Yongkang;TIAN Zhan;CHEN Kuifu;CHANG Zheng(College of Sciences,China Agricultural University,Beijing 100083)

机构地区：[1]中国农业大学理学院,北京100083

出　　处：《物理与工程》2023年第3期34-37,共4页Physics and Engineering

摘　　要：涉及力量与技巧的视频广告对社会大众具有独特的吸引力,挖掘其中的科学原理和物理元素,既能促进科普、激发大众物理兴趣,也能有效丰富课堂教学。本文聚焦某品牌汽车营救濒临坠崖重型卡车的视频广告,通过对广告场景的物理力学建模,揭示汽车“以弱胜强”的关键并非广告宣称的动力性能,而是得益于广告场景中粗糙地面提供的较大摩擦力以及卡车空载导致的较小翻转力矩。该视频广告具有震撼性和趣味性,是优秀的科普素材。本文的相关分析综合应用了物理教学中多个重要知识点,富有启发性和知识性,可作为丰富课堂教学活动的典型案例推广使用。Video commercials with power and skill uniquely appeal to the general public.Ex-ploiting the scientific principles and physical elements involved is a powerful tool for promo-ting science and stimulating the interest in physics,as well as effectively enriching teaching materials in class.This paper focuses on a commercial in which a small car shockingly rescues a heavy truck falling off a cliff.The physical and mechanical modeling is carried out according to the advertising scene.It reveals that the key to the“weakness conquers strength”is not the performance of the car,but the large friction provided by the rough ground and the small flip-ping moment due to the unloaded truck.This video advertisement is shocking and interesting,and is excellent popular science material.The relevant analyses in this paper involve the com-prehensive application of essential knowledge in physics,which is enlightening and knowl-edgeable and can be used as a typical example to enrich classroom teaching activities.

关 键 词：力学模型 最大静摩擦力 力矩平衡 科普 教学案例 

分 类 号：O39[理学—工程力学]