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2014年安徽高考理综卷第24题是一个多体多过程运动问题,因此运动过程较为繁杂,直接通过常规方法分段分析,进行求解是很困难的,笔者通过几种特殊方法求解,愿与大家一起探讨。题目:在光滑水平地面上有一凹槽A,中央放一小物块B,物块与左右两边槽壁的距离如如图1所示,L为1.0m,凹槽与物块的质量均为m,两者之间的动摩擦因数μ为0.05,开始时物块静止,凹槽以的=5m/s初速度向右运动,设物块与凹槽槽壁碰撞过程中没有能量损失,且碰撞时间不计。g取
2014 Anhui college entrance examination volume 24 is a multi-body multi-process movement problems, so the movement process is more complicated, directly through the conventional method of sub-analysis, the solution is very difficult, the author through several special methods to solve and is willing to We discuss together. Title: There is a groove A on the smooth horizontal ground, a small block B in the center, the distance between the block and the groove walls on the left and right as shown in Fig. 1, L is 1.0m, the mass of the groove and block are m , The dynamic friction coefficient between the two μ0.05, the beginning of the block stationary, the groove to the initial velocity = 5m / s to the right, set the block and the groove wall collision process without energy loss, and the collision time Excluding. g take