车子包括自行车、摩托车、电动车、汽车等,是生活中常见的交通工具,由于它们安全、便捷,是人们日常的代步工具。同时车子又涉及到很多的物理知识,尤其在力与运动,功与能等方面,作为中学阶段从事一线教学的物理教师,常常会面临一些困惑。例如在分析力与运动关系时,通常的做法是将整车视为质点,将车内驱动系统所产生的动力视为牵引力,将路面摩擦力及风力等视为阻力。这 Cars, including bicycles, motorcycles, electric cars, cars, etc., are common means of transport in life, because of their safety and convenience, is the daily means of transport. At the same time the car also involves a lot of physical knowledge, especially in the aspects of strength and exercise, work and energy, as a physics teacher engaged in first-line teaching in middle school stage, they often face some confusion. For example, in analyzing the relationship between force and movement, it is common practice to consider the entire vehicle as a mass, regard the motive power generated by the in-vehicle drive system as the traction, and regard the pavement friction and wind forces as resistance. This