小议流体情境中的相互作用和功率问题

Comment Briefly on Interaction and Power Issues in Fluid Situation

以水流冲击、喷泉托物等实际情境为代表的流体问题,源于生活、富有趣味性,是将情境与物理模型结合,培养学生应用力学工具解决具体问题的良好素材.讨论了流体情境中的两类常见问题(求流体作用力和流体喷射功率),针对学生学习中采用动量、能量方法常得出不自洽结果的常见疑惑,从对概念规律深入理解的角度,对错因进行了分析讨论,并全方位、多层次地进行了拓展.

Fluid dynamic problems,such as the impact of water flow or a fountain,are practical and interesting.By analyzing the force and power in the impact of water flow,students could develop their abilities to build fluid dynamic models and solve practical problems.We found that students usually get contradictory results by using momentum method and energy method,which is confusing.In this paper we corrected students’misunderstanding in physics laws and concluded that consistent results should be reached from these two different perspectives.