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在日常生活中利用和防止摩擦的现象到处可见,如汽车行驶就是利用了轮胎和路面之间存在的摩擦,汽车的制动也是将摩擦原理用于制动器上。当大件货物放在地面上拖行时,如果地面上有许多水,移动起来就比较容易;假若撤上油再把滑动改为滚动,搬动起来会更加方便。古代劳动人民建造埃及的金字塔和中国的古长城时就利用了以上减小摩擦的原理,实现巨大建筑材料的搬运。 国民经济生产的每一个领域内,摩擦与润滑的应用都很普遍。在钢
The phenomenon of utilizing and preventing friction in daily life can be seen everywhere. For example, the car utilizes the friction between the tire and the road surface, and the brake of the car applies the principle of friction to the brake. When bulky goods are towed on the ground, it is easier to move them if there is a lot of water on the ground. If you remove the oil and change the sliding to rolling, it will be more convenient to move it. When the ancient working people built the pyramids in Egypt and the ancient Great Wall in China, they took advantage of the above principle of friction reduction to carry huge quantities of construction materials. In every area of national economy, the application of friction and lubrication are common. In steel