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牵引力是力学中常见的一个概念。它的物理意义是十分明确的,是一个物体对另一个物体的作用力。如机车牵引列车或汽车牵引挂车时,牵引力指的是前者对后者的拉力。根据这个道理,在分析汽车受力时,汽车的牵引力本来也应该是别的物体对汽车的作用力。可是,对于这样一个普通问题,由于长期以来被人们所忽视,结果有的人便形成了一种错误的观念:汽车牵引力是它的发动机施加给汽车的推动其前进的作用力。不但如此,在前几年编的一些物理书籍乃至去年省编中学物理课本中也存在这种错误观念。上海人民出版社出版的青
Traction is a common concept in mechanics. Its physical meaning is very clear, is the force of one object on another object. Such as locomotive tractor train or car towing trailer, the traction refers to the former of the latter pull. According to this reason, in analyzing the force of the car, the traction of the car should also be the force of other objects on the car. However, for such a common problem, as a result of being neglected by people for a long time, the result is that some people make the wrong idea that the car’s traction is the force exerted by its engine on the car to push it forward. Not only that, some of the physical books compiled a few years ago, and even last year, the provincial physics textbooks also exist in this wrong concept. Shanghai People’s Publishing House published green