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一、具体感知天平平衡原理,做好知识铺垫1.出示天平,向学生讲解天平使用方法。启发提问:如果我在天平的左边放一20克的重物,要使天平平衡,右边得放多重的砝码?学生操作后回答或猜想后验证。(20
First, the specific balance of the principle of perceived balance, paving the way for knowledge 1. To produce a balance, explain to the students how to use the balance. Inspired Q: If I put a 20g weight on the left side of the balance, balance the balance and put multiple weights on the right. (20