【摘 要】
：
笔者在某一教学资料上见到下面一道题目,感到给出的解析有些不妥,愿同大家商榷.如图1所示,一条质量为M、长度为L的均质链条,盘绕在光滑的水平桌面上.现用一个恒定的力F竖直向
【机 构】
：
河北省滦南县第一中学 河北滦南063500
论文部分内容阅读
笔者在某一教学资料上见到下面一道题目,感到给出的解析有些不妥,愿同大家商榷.如图1所示,一条质量为M、长度为L的均质链条,盘绕在光滑的水平桌面上.现用一个恒定的力F竖直向上拉起链条的一端,求全部链条刚好离开桌面时的速度大小.解析:当全部链条刚好离开桌面时,恒力F对链条做
The author saw the following question on one of the teaching materials and felt that the analysis given was not appropriate. I would like to discuss with you. As shown in Figure 1, a homogeneous chain of mass M and length L is coiled around the smooth On the horizontal desktop, use a constant force F to pull up one end of the chain vertically, and find the speed of all the chains when they just leave the desktop. Resolution: When all the chains just leave the desktop, Constant Force F makes the chain
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