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自行车是我们常用的出行工具,其实自行车在构造上和使用中蕴涵了许多力、光、声、能等诸多物理知识。一、自行车上的摩擦1.减小摩擦。车的前轴、中轴及后轴、车把转动处,脚蹬转动处等地方,都安有钢珠,采用滚动以减小摩擦。为更进一步减小摩擦,人们常在这些部位加润滑剂。2.增大摩擦。多处刻有凹凸不平的花纹以增大摩擦。如车的外胎,车把手塑料套,蹬板套、闸把套等。变滚动摩擦为滑动摩擦
Bicycles are our common travel tools. In fact, bicycles contain a lot of physical knowledge such as force, light, sound, and energy in their construction and use. First, the friction on the bike 1. Reduce friction. The front axle, the middle axle and the rear axle of the car, the turning position of the handlebars, and the turning place of the pedals are all equipped with steel balls, and rolling is adopted to reduce the friction. In order to further reduce the friction, people often add lubricant in these parts. 2. Increase friction. A number of uneven patterns are engraved to increase friction. Such as the car’s tires, handlebars plastic cover, cover plate, brake handles and so on. Change rolling friction to sliding friction