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近年来,随着我国经济的高速发展,人民生活水平的不断提高,汽车进入普通百姓家庭已逐步成为现实,尤其城市家庭私家车的数量越来越多.在生活中仔细观察与分析,我们便会发现汽车的设计和使用几乎涉及了初中物理知识体系中的方方面面,而且以汽车为载体的中考试题也越来越多,对此就有关汽车的力学问题略作分类以与各位共同赏析.一、相关问题分析1.汽车的外形设计为流线型的目的:为了减小汽车行驶时受到的阻力.2.汽车的动力:地面对主动轮的摩擦力(主动轮与从动轮与地面的摩擦力的方向相反,与自行车类似);用力踩刹车则是增大压力以增大摩擦;急刹车时,车轮与地面的摩擦由滚动摩擦变成滑动摩擦.3.汽车急刹车(减速)时,乘客会向车行方向倾
In recent years, with the rapid development of China’s economy and the continuous improvement of people’s living standards, the entry of cars into ordinary families has gradually become a reality. In particular, the number of private cars in urban households is increasing. Through careful observation and analysis in life, we It will be found that the design and use of automobiles involves almost all aspects of the junior middle school physics knowledge system, and more and more mid-level test questions are regarded as vehicles. This is a brief classification of mechanical issues relating to automobiles to share with all of you. 1. Analysis of related issues 1. The purpose of the car’s exterior design is to streamline: To reduce the resistance of the car when it is driving. 2. The power of the car: The friction force of the driving wheel (the friction between the driving wheel and the driven wheel and the ground) The direction of the opposite is similar to that of a bicycle); pressing the brake harder increases the pressure to increase the friction; when the brake is suddenly braked, the friction between the wheel and the ground changes from rolling friction to sliding friction. 3. When the car brakes (decelerates), the passenger Will tilt toward the car