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题目.(2013年高考新课标Ⅱ卷第25题)一长木板在水平地面上运动,在t=0时刻将一相对于地面静止的物块轻放到木板上,以后木板运动的速度-时间图像如图1所示.已知物块与模板的质量相等,物块与木板间及地面与木板间均有摩擦,物块与木板间的最大静摩擦力等于滑动摩擦力,且物块始终在模板上.取重力加速度的大小g=10 m/s2,求:(1)物块与木板间、木板与地面间的动摩擦因数;
(2013 college entrance examination new Curriculum vitae Volume 25) a long wooden board in the horizontal ground motion, at t = 0 moment will be a stationary object on the ground light on the wooden board, after board movement speed - The time image is shown in Fig. 1. It is known that the mass of the object and the template are equal, the friction between the object and the board, the friction between the floor and the board, the maximum static friction between the object and the board are equal to the sliding friction, On the template, take the magnitude of gravitational acceleration g = 10 m / s2, and find: (1) the dynamic friction coefficient between the block and the wood board and between the wood board and the ground;