2022年人教版物理第十五章《功和机械能》单元教案1 .pdf

名师精编优秀教案人教版九年级物理第 15 章、功和机械能复习课学案学习过程：一、知识点巩固1、做功的两个必要因素、.练习：（分析下列事例，是否做功。）马拉车搬而未起提着水桶水平前进光滑的水平冰面上滑动的冰块2、功的计算公式：，各物理量的单位分别是：练习、课本 P107图 15.21 中，人的拉力做功分别是W1，W2，W3。3、简述什么叫有用功、额外功、总功、机械效率事例分析：分析哪些是有用功、额外功、总功1用桶和绳子从井口拔一桶水（G桶=20N、G绳=10N、G满水=100N,h井深=10m）W有=,W额=,W总=.。2桶掉到井里了，从井里捞出桶时，桶里有半桶水）W有=,W额=,W总=.。4 功率：功率是用来表示的物理量，叫做名师精编优秀教案功率，公式：单位：练习：甲乙二人爬杆比赛，请添加相关条件，比较功率大小。5、什么叫动能，动能大小的影响因素是。什么叫做势能（重力势能、弹性势能）它们的影响因素分别是练习：洒水车沿水平地面匀速前进洒水过程中，动能，因为。喜鹊与麻雀在空中飞行，如果它们的动能相等，那么麻雀比喜鹊飞的，如果它们重力势能相等，那么麻雀比喜鹊飞的。6、机械能在数值上等于之和。分析：滾摆在上升过程中，质量，速度，动能，质量，高度，重力势能，在此过程中能转换为能，滾摆在下降过程中呢？二、知识结构梳理。文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 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ZD2I10I3L2A2名师精编优秀教案发生车祸时车毁人亡冰雹砸毁塑料大棚和农作物高空坠物砸伤行人台风吹翻轮船3、关于动能和重力势能影响因素的探究如图所示,分别让质量不同的钢球A和 B从该斜面的同一高度滚下去撞击水平面上的一个小木块.回答下列问题:(1)设计该实验的目的是要探究.(2)通过可以判断钢球动能的大小.(3)该实验用到了物理学中常用的一种研究问题的方法叫法.(4)此实验得出的结论是：(5)若若还想探究动能的大小与物体运动速度的关系应如何操作？文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2名师精编优秀教案4、如图 5 所示的动滑轮重5N，不计绳重和摩擦，用力 F 匀速提起重为45N的重物，并使其升高1m，则拉力所做的有用功为_J，此装置的机械效率为_ 5、小芳同学设计了一个高度可调节的斜面来探究斜面的省力情况、斜面的机械效率与斜面的倾斜程度之间的关系，如下图所示。她首先测出小车重，然后用弹簧测力计沿斜面拉动小车，调节斜面倾斜角 的大小多次测量，得到下表所示的数据：斜面倾斜角小车重G/N 斜面高h/m 斜面长S/m 拉力F/N 有用功W有/J 总功W总/J 机械效率12 5 0.2 1 2.1 2.1 48%30 5 0.5 1 3.6 2.5 69%45 5 0.7 1 4.3 3.5 4.3 请你替小芳在上表中的空格处填上适当的数据。分析上表中的数据，可以得出的探究结论是：斜面倾斜角 越，斜面越省力，斜面的机械效率越。实验过程中拉力的方向应与斜面。文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2名师精编优秀教案 若想探究斜面的机械效率与物重的关系，则要保持不变，斜面的光滑程度不变，只改变,这种研究问题的方法我们称之为法。6、小明对“斜面的机械效率与什么因素有关？”这一课题，提出了如下一些值得探究的猜想：斜面的机械效率与斜面的倾斜程度有关；斜面的机械效率与斜面的粗糙程度有关；斜面的机械效率与斜面的长度有关；斜面的机械效率与物体的重力有关。给你如图15 所示的装置，请你选择上述猜想中的一项，并解答下列问题：（1）你选择的猜想是（填写序号）（2）要用图 13 中的器材完成你选择的探究，还要补充的器材是：（至少写出两种）（3）在实验探究的过程中，需要控制不变的因素有：文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2名师精编优秀教案；。文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2文档编码:CY6R2N9T8U10 HX8Z4K8M10G2 ZD2I10I3L2A2