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验证牛顿第二定律是高中物理中的一个重要实验,要取得实验成功必须做到两点:(一)实验时要平衡摩擦力;(二)实验过程中保证沙和沙桶的总质量远小于小车和车上砝码的总质量。为什么我们要做到这两点呢? 设沙和沙桶的总质量为m,小车和车上砝码的总质量为M。带有滑轮的长木板与水平面的夹角为θ。我们以小车(及其上砝码)和沙桶(和沙)作为研究对象,根
The verification of Newton’s second law is an important experiment in high school physics. To achieve a successful experiment, two things must be done: (1) to balance the friction during the experiment; (2) to ensure that the total mass of the sand and sand buckets is much smaller than the trolley during the experiment. And the total mass of the weight on the car. Why do we have to do these two things? The total mass of sand and sand barrels is m, and the total weight of the trolleys and car weights is M. The angle between the long board with a pulley and the horizontal plane is θ. We use the trolley (and its weight) and the sand bucket (and sand) as the research object.