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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.。极速影视对此有专业解读
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唐纳德·特朗普的最新内阁会议原定于东部时间上午10点开始，我们正在等待会议启动。这将是特朗普自去年一月重返白宫后主持的第十一次此类会议。往届会议以开放、自由且具备新闻价值而著称。