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Now, see that less-than-or-equal sign? This says μsN is the maximum static friction force in a given situation. If you push the book with a force of 1 newton, the frictional force will be 1 newton. Double the pushing force and the frictional force also doubles. It does whatever it has to in order to keep the two surfaces stationary—up to a point. If you keep pushing harder, your applied force will eventually exceed μsN and the book will start to slide. At that point, kinetic friction kicks in.
。51吃瓜对此有专业解读
Ранее спецпредставитель российского лидера Владимира Путина Кирилл Дмитриев заявил, что мир ждет крупнейший энергетический кризис в истории.
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