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1、名师精编优秀教案牛顿第二运动定律的应用知识要点：（一）牛顿第二定律：1.动力学的两类基本问题（1）根据物体的受力情况，确定物体的运动情况。基本思路是：利用牛顿第二定律maF合求出物体的加速度a；再利用运动学的有关公式求出速度tv和位移S等。（2）根据物体的运动情况，确定物体的受力情况，其基本思路是：分析物体的运动情况，选用运动学公式求出物体的加速度；再由牛顿第二定律求出力。（3）解题中加速度的桥梁作用见图物体受力情况分析牛顿第二定律加速度运动学物体运动状态及其变化（4）两类问题的意义：已知物体受力情况，由牛顿定律确定其运动情况如航天飞行器，由发动机决定受力情况，从而确定运动情况。已知物体运动情
2、况，确定受力情况，如观测到天体运行规律，确定天体与周围天体的作用情况，探索未知天体情况。2.应用牛顿运动定律的解题步骤（1）确定研究对象（解题时要明确地写出来）可根据题意选某物体（题设情景中有多个物体时更应注意），也可以选一个或几个相关物体（存在相互作用的物体）为一个系统作为研究对象，所选研究对象应是受力或运动情况清楚便于解题的物体。有的物体虽是涉及到的对象，但受力情况或运动情况不能直接求出解，通过牛顿第三定律，取相作用的物体作研究对象。（2）全面分析研究对象的受力情况，正确画出受力示意图，一般按力的性质依次分析物体受力情况。根据力的平行四边形定则或正交分解法求合力（由牛顿第二定律求出加速度）
3、。（3）全面分析研究对象的运动情况，画出过程示意图，找出前后过程的联系。（4）利用牛顿运动定律求解（5）讨论结果（二）力学单位制：1.力学单位制：（1）基本物理量：反映物理学基本问题的物理量。如力学中有三个基本物理量：质量、时间、长度。一般运动都是这三个基本物理量发生变化或组合发生变化。（2）基本单位：每一个物理量都可以用不同的单位表示大小，其中一种最直接简单的叫基本单位，其它叫辅助单位。长度（L）cm、m、km。质量（M）g、kg、t。时间（T）s、min、h。（3）导出单位。根据物理概念（定义）或规律确定各物理量间的关系，由此确定的单位关系组合叫导出单位。如压强单位为PamN112，电阻单
4、位AV111。名师精编优秀教案速度单位tSv，单位是sm/。（4）单位制。由基本单位和导出单位按一定关系构成的系统叫单位制，如我国历史上曾用丈尺寸表示长度，用斤、两表示质量，用时、刻表示时间长短，物理历史上曾用cm、g、s 制。如速度是scm/，力的单位是2/scmg（达因）（dgn），现在都统一为国际制（SI制）。（5）SI 制：m、kg、s制，速度单位为sm/，力的单位为2/smkg（牛顿）。（6）单位制的作用，一是简化计算：如牛顿第二定律中，若质量单位不是kg，加速度单位不是2/sm，公式中1k，计算中就繁琐，当这些单位都是国际制基本单位时1k。二是可以通过单位检验结果表达式反映的规律是
5、否正确，如若推出自由落体位移公式gth21，可以验证是错的。（三）超重与失重：1.超重现象：物体对支持物的作用力大于其重力的现象叫超重，人对地面压力大于重力叫超重，举重时人对地面压力大于人的体重不叫超重。产生原因：物体在竖直方向有向上的加速度时产生超重现象。由牛顿第二定律第三定律不难分析出结论。2.失重现象：物体对支持物的作用力小于重力的现象叫失重，手拉单杠对地面压力减小不叫失重。完全失重：对支持物作用力为零。（通常是悬在空中或在空中自由下落）叫完全失重。研究超重和失重有重要意义。三.重难点分析：1.牛顿第二定律与力学单位制的联系物理学不同于数学，物理学中的各个物理量都是有单位的。单位制也不仅
6、仅是单位的换算，它是由基本单位和导出单位所组成的，即是有关基本单位、导出单位等一系列单位的体制，由于所采用基本量的不同，基本单位的不同，以及用来推导导出单位的定义公式的不同，存在着多种单位制。多种单位制并用，给科学技术的交流和发展带来不便。为了避免多种单位制的并存，国际上制定了一种通用适合一切计量领域的单位制，叫做国际单位制，国际代号为 SI详见课本附录“图际单位制（SI）”。国际单位制是在1960 年笫十一届国际计算大会上通过的，其后向全世界推荐使用。在国际单位制中，所有的力学量都是由长度、质量、时间这三个基本量组成的，其他物理量都是导出量，共单位是导出单位力的单位“N”就是导出单位。2.量
7、纲检验法一个物理量可由几个基本物理量组成，它与基本物理量间的关系式为量纲式，由量纲式也就确定了这个物理量的单位。如速度的定义式为tsv，说明了速度的量纲式为11TL（注：量纲式均由大写字母表示），加速度的定义式为tvvat0，说明了加速度的量纲式文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4
8、HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O
9、7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4
10、HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O
11、7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4
12、HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O
13、7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2名师精编优秀教案为21TL，而对力的单位的确定，则是由牛顿笫二定律，规定1N 的力使质量为1kg 的物体产生2/1
14、sm的加速度，也就是牛顿第二定律的数学表式中的比例常数取1，力的量纲式为211TLM。对于以后的电学物理量，也是用相同的规定来确定其量纲式由量纲式可以确定一个表达式是否正确。【典型例题分析】例 1 如图所示，放在水平面上的物体质量为kg2，受到一个斜向下的与水平方向成30角的推力NF10的作用，从静止开始运动。已知物体与水平面间的摩擦因数为1.0，取10g2/sm。（1）求物体s5末速度和s5内发生的位移。（2）若s5末撤去推力，物体在水平面上运动的总位移是多少米？F解：取物体为研究对象。由于物体只能沿水平面运动，取水平向右为x轴正向，竖直方向为y轴，物体受四个力分别是重力mg，推力F，地面的
15、支持力NF，摩擦力fF，加速度为a分解F为1F和2F30cos1FF30sin2FF)3()2(0)1(21NfNfFFFmgFmaFF把（3）（2）代入（1）解得mmgFFa)30sin(30cos2)1025.010(1.0866.0102/08.3smatvvt000vatvtsm/4.15508.3文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6
16、N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:C
17、G7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6
18、N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:C
19、G7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6
20、N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:C
21、G7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2名师精编优秀教案matS5.382508.32121
22、2xyFNFfF10FmgF2（2）s5末撤去推力，物体受力情况如图所示FNFfVmg0mgFNNfFFamFf解方程组得ga101.02/1smavvSt2202m6.118124.152总位移mSSS1.1576.1185.38总例 2 一辆载重汽车，总质量是t 8，从静止起开上一山坡，山坡的坡度为02.0（每前进m100长高m2）若汽车是匀加速行驶，经m100后速度达到hkm/18，摩擦阻力是车重的03.0倍，求汽车上坡时牵引力多大？（取2/10smg）xFmgFf0yFN解：取汽车为研究对象，受力如图示把重力分解为x方向，y方向的分力。文档编码:CG7J9D9W4Y4 HN3X8Z8I
23、6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:
24、CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I
25、6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:
26、CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I
27、6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:
28、CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I
29、6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2名师精编优秀教案)3(2)2(sin)1(0cos2asvmamgFFmgFtfN由（3）得svat22代入（2）且mgFf03.0svmmgmgFt2100203.02mmgmgF10022502.003.0Nm310510)0125.002.003.0(例 3 物体的初速度0v竖直向上抛出，到最高点后返回到抛出点。设运动中所受空气阻力大小不变，为重力的02.0倍。求物体往返时间。V.mgf.fmga下（
30、a）（b）解：物体上升时受力如图)(a所示上mamgfmgf02.0ga02.1上gvavt02.100上上gvavh04.222020上上下落时下mafmg下mamg98.0ga98.0下上下hh221下下下tah下上下aht2下上aav2220下上aav20ggv98.002.120gvgv0098.002.11下上总tttgvgvgvgv000098.102.102.202.1文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N
31、5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG
32、7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N
33、5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG
34、7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N
35、5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG
36、7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N
37、5 ZH7T9N8O7X2名师精编优秀教案【模拟试题】1.在力学中，选定、三个基本物理量的单位为基本单位，在国际单位制中，三个力学量的基本单位是、。2.下列物理量的单位中，属于国际制基本单位的是。A.毫米B.米C.克D.千克E.牛F.焦耳3.指出下列公式的单位，及其对应物理量的名称：A.gl，单位是，物理量名称是。B.lv2，单位是，物理量名称是。C.lvm2，单位是，物理量名称是。4.声音在空气中的传播速度v 与空气密度，压强 p 有关，下列关于空气中声速的表达式中正确的是（）（k 是无单位常数）。A./kpvB./kpvC.pkv/D.pkv5.质量为M的木块位于粗糙水平面上，若用大小为F
38、的力水平拉木块，其加速度为a。当拉力方向不变，大小变为F2时木块的加速度为a，则（）A.aaB.aa2C.aa2D.aa26.如图所示底板光滑的小车上用两个量程为N20完全相同的弹簧秤甲和乙系住一个质量为kg1的物块，在水平地面上，当小车作匀速直线运动时，两弹簧秤示数均为N10。当小车作匀加速直线运动时，弹簧秤甲的示数N8。这时小车运动的加速度大小是（）甲乙A.2/2smB.2/4smC.2/6smD.2/8sm7.某消防队员从一平台上跳下，下落m2后双脚触地，接着他用双腿弯屈的方法缓冲，使自身重心又下降了m5.0，在着地过程中地面对他双脚的平均作用力估计为（）A.自身所受重力的2倍B.自身所
39、受重力的5 倍C.自身所受重力的8 倍D.自身所受重力的10 倍8.如图所示，一根轻弹簧的一端系着一个物体，手拉弹簧的另一端，使弹簧和物体一起在光滑水平面上向右做匀加速直线运动，当手突然停止后的短时间内，物体可能的运动是（）F文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N
40、5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG
41、7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N
42、5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG
43、7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N
44、5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG
45、7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2名师精编优秀教案A.物体继续向右加速运动B.物体开始向右匀速运动C.物体先加速后减速向右运动D.物体先减速后加速向右运动9.放在光滑水
46、平面上的物体受三个水平力作用处于静止状态，已知2F垂直于3F。若三个力中去掉1F，物体产生的加速度大小为2/5.2sm；若去掉2F，物体产生的加速度大小为2/5.1sm；若去掉3F则物体产生的加速度大小为（）A.2/5.1smB.2/0.2smC.2/5.2smD.2/0.4sm10.一物块从倾角为，长为S的斜面的顶端由静止开始下滑，物块与斜面间的动摩擦因数为，求物块滑到斜面底端所需时间。11.总质量为M的热气球，以速度v匀速下降，为了阻止继续下降，在0t时刻，从热气球下释放一个质量为m的砂袋，若空气阻力不计，气球浮力不变。（1）热气球经多长时间停止下降？（2）此时砂袋的速度多大？12.质量为
47、M的斜面体，放于粗糙水平地面上，斜面倾角为。质量为m的物块与斜面间摩擦因数为，物块沿斜面匀加速下滑时，斜面体保持静止不动，斜面体受到地面的静摩擦力多大？什么方向？Mm13.已知质量为m的木块在大小为F的水平拉力作用下沿粗糙水平面作匀加速直线运动，加速度为a。（1）求木块与水平面间摩擦因数是多少？（2）若在木块上再加一个推力，保持木块的加速度不变，求此推力与水平拉力F的夹角多大？14.如图所示质量为kg1的小球穿在倾角等于30的斜杆上，球与斜杆的动摩擦因数63，小球在竖直向上的拉力F作用下，沿杆加速上滑，若小球的加速度大小2/0.1sma，求拉力F的大小。（2/10smg）F30【试题答案】1.
48、长度、质量、时间；米、千克、秒2.米、千克（B、D）文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9
49、N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4
50、Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9N8O7X2文档编码:CG7J9D9W4Y4 HN3X8Z8I6N5 ZH7T9