小小的一辆汽车,应用了无数的物理知识.单就刹车来说,它就涉及摩擦力矩、能量等物理知识.本文专门研究刹车时车轮被抱死的利与弊,分析汽车刹车时如果车轮停转,车轮与地面发生滑动摩擦,车轮如果还在转动,刹车盘与轮盘发生滑动摩擦,并分析如何使车更快地停下来和车轮停转带来的其他影响. A small car uses numerous physics knowledge. For brakes alone, it involves physical knowledge such as frictional moments, energy, etc. This article focuses on the pros and cons of locking wheels when braking, and analyzes if the car brakes. The wheels are stopped and the wheels are sliding frictionally with the ground. If the wheels are still turning, the brake discs and the discs will have sliding friction and analyze how to make the car stop faster and other effects brought about by the wheel stall.