unit19-8内容摘要:
______________________________________________________________ ② 4, 5, 6 又该如何转换。 is known to be the last surviving member of his subspecies ________________________________________________________________ early setlers were understood to have destroyed the ecological balance on the islands and the livelihoodd of Gee’s clan ________________________________________________________________ archipelago is expected to make a full recovery. ________________________________________________ ③ 为什么 to 后跟动原也可以跟现在完成时。 is known that storks live in a cleam environment ________________________________________________ 2. lt was said that Jack had finished his homework ________________________________________________ step4。 阅读理解 lt was got up early in the morning .she had。unit19-8
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_______________________________; __________ ___________; ______________; (4)表达式 ( 5)讨论: ①与密度表对照计算的结果,你认为可能是什么物质做的。 密度值不完全相同的原因可能是什么。 ②若按 _________顺序,测量结果会偏 _____。 变式训 练:小明测量某种液体密度的实验 操作步骤如下:①调节好天平
度物体才滑动,滑动后还要一定大小的拉力作用来维持物体的运动 通过实验感知桌面对运动物体有阻碍作用 建立静摩擦和滑动摩擦的概念 二、活动: 8. 5 探究改变摩擦力大小的方法 15’ 你能改变物体所受到的摩擦力 的大小吗。 引导学 生对如何测量摩擦力的大小进行研究 如何记录。 (用最大 示数加最小示数除以 2 的方法记录) 将学生分为四大组。 引导学 生分别对课本上的思考内容进行研究 点评
生答 学生答 学生答:会,不会。 学生思考 通过活动加深学生对 形变的理解。 学生对外力使物体发生形变的同时,手有什么感觉,学生不一定能很准确的答出,这里教师要注重引导。 学生答不全,教师进行补充。 坚硬的物体也会发生形 变吗。 师:那我们就以坚硬的物体是否会发生形变为主题,请同学们分为正方和反方来辩论一下。 正方观点:坚硬的物体会发生形变。 反方观点:坚硬的物体不会发生形变。 师
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