我国是一个人口大国,也是一个自行车王国,每天清晨、傍晚,滚滚车流在城市里都是一道道壮观的景致.在自行车上用到了许多物理知识,下面我们就从物理的角度剖析一下自行车.自行车上的摩擦把手、脚踏板、车胎以及坐垫,它们表面都做成凹凸不平的形状,这样可以有效地增大摩擦力,防止打滑.此外,自行车有些地方则需要减小摩擦, China is a populous country and a bicycle kingdom, and every morning, evening, billowing traffic is spectacular scenery in the city.A lot of physical knowledge is used on the bicycle, and we will analyze the bicycle from a physical point of view. On the friction handle, pedals, tires and cushions, their surfaces are made of uneven shape, which can effectively increase the friction to prevent slipping.In addition, the bike in some places you need to reduce the friction,