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在验证牛顿第二定律的实验处理实验数据的过程中,有很多同学作 a-F 和 a-1/M图象时,得到的不是过原点的直线,下面就根据本实验的原理和应注意的事项对图象作进一步分析:实验装置如图1所示,用细线将小车(质量为 M)和砂桶(内装细砂,总质量为 m)连接起来,构成一个系统.当小车与斜面之间的摩擦力已经平衡,细线的质量忽略不计,系统做加速运动时,则可列出小车系统的一组动力学方程:
In the process of verifying the experiment data of Newton’s second law, when many students made aF and a-1/M images, they did not get straight lines passing through the origin. Here are the principles according to this experiment and the matters to be noted. For further analysis of the image: The experimental device is shown in Fig. 1. The trolley (with mass M) and the sand bucket (with fine sand, total mass m) are connected by thin lines to form a system. When the trolley and the inclined plane The friction between the two has been balanced. The quality of the thin line is negligible. When the system is doing acceleration, a set of dynamic equations of the car system can be listed: