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自行车是大家生活中常见的交通工具,其中有许多物理知识,可以作为教师教学中的“教材”。一、摩擦知识摩擦力的存在,既是自行车前进的动力,也是后退的阻力。所以车上既有增大摩擦的地方,又有减小摩擦的地方。比如:在自行车外胎上的花纹,就是用来增大摩擦的;自行车的前轴、中轴、后轴、车把转动处,脚蹬转动处等地方,都安有钢珠,是用来减小摩擦的。
Bicycles are a common means of transport for all people’s life. Among them, there are many physical knowledge that can be used as teaching materials for teachers. First, friction The existence of friction knowledge, both the power forward bike, but also the resistance of the back. So the car has both increased friction, there are places to reduce friction. For example: the pattern on the bicycle tire is used to increase the friction; bike front axle, the axis, the rear axle, the handlebar rotation, pedal rotation and other places, all with steel balls, is used to reduce Friction.