巧用手摇发动机突破“匀速上升”难点

摘要

用弹簧测力计测量动滑轮下的钩码匀速上升时的拉力大小时，很难使弹簧测力计保持匀速直线运动，为此，将手摇发电机应用到实验中，并设计了相应的实验电路，解决了该难题。本文详细介绍了该改进方法的具体实现过程及实验效果。%When using spring dynomometer to measure the pulling force needed to maintain a steady-speed ascending of a weight ,the spring dynomometer should moving at a constant speed .In order to overcome this difficulty ,a hand generator was used in the experiment ,and the corresponding circuit was designed .This paper detailed the improved method and the experimental effect .