天平兩端各有一一個小水桶,可以裝沙子。
將裝好沙子的水桶掛在天平上.比較天平的高低.從而感知天平兩端的重量。
能力培養(yǎng):理解平衡的概念,培養(yǎng)觀察能力、比較能力和表達能力。
Super Administrator | 29/07/2015 |
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