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1.探究守恒量【实验1】将小钢球用细线悬挂一端固定在小黑板上部,让小球摆动,通过实验发现,小球可以摆到跟释放点等高处,再用一个钉子固定在小黑板上某点挡住细线,再观察,发现仍然等高.引导学生讨论探究摆动中能量的转换,分析实验现象所展示的能量转化特点,实验2中小球在摆动过程中通过重力做功,势能与动能互相转换:
1. Investigate Conserved Quantity [Experiment 1] Attach a small steel ball to the upper part of the small blackboard with a thin wire and let the small ball swing. Through experiments, the ball can be placed at the same height as the release point, and then fixed with a nail. A small point on the small blackboard was blocked by a thin line and observed again. It was found to be still high. Students were guided to discuss the energy conversion in the exploration of the swing, and the energy conversion characteristics demonstrated by the experimental phenomena were analyzed. In the experiment 2, the small ball performed work by gravity during the swing process. Potential energy and kinetic energy are converted to each other: