《红对勾 45分钟作业与单元评估》高中物理(人教版)必修一配套训练：第四章 《牛顿运动定律》综合评估(Ⅰ)

如图1(a)～由牛顿第二定律得mgsinα,ma～FN,mgcosα,0,同理～对b有:mgsinβ,ma～FN,mgcosβ1122,0.对木块M进行受力分析～如图1(b)～在竖直方向上有:F,MgN,FN?sinβ,FNsinα,0～α，β,90?.由以上各式得F,Mg，mg. 12N 答案:A 6(如图2所示，质量为m的物体悬挂在轻质支架上，斜梁OB与竖直方向的夹角为θ，设水平横梁OA和斜梁OB作用于O点的弹力分别为F和F，以下结果正确的 12 图2 是( ) mgA(F,mgsinθ B(F, 11sinθ mgC(F,mgcosθ D(F, 22cosθ d pietesting. Stone used steel keel, installation job main including following steps: 2.1 construction Qian prepared 2.2 pre burie th the construction plan of the specification and the file size in the appropriate authority inspection departments qualifiedsaving performance in front of the construction should be in accordance wi-eakage in distortion performance, performance and energyround, the same pattern, size error in 0.5mm stone. Air infiltration properties, stone curtain wall wind pressure rainwater lbackg ance is thetypeset by the owners ' consent before they can purchase and order under the program, each stone must use the sameng self acceptance, signature acceptance after the representatives of the party were invited. Requirements: (1) covert acceptinishied is eligible. (6) complete information has been collected. Documentation: should follow construction progress at any time fate. (2) is fixed securely. (3) tightening compliance requirements. (4) have an impact on other projects. (5) the material usrelated. Mainly in the following aspects: (1) acceptance of positioning is accur-ried out according to acceptance of concealed worksessment, data compilation: buried, belongs to the concealed works construction, therefore its quality inspection must be carfinished products. 8. quality as-that construction site clean, consciously maintain sanitation. (4) ensure the safety of materials and semin of partyvisioscope of previous construction (1) project outline: to understand the site profiles, familiar with the construction and super roject schedule, technical information, tools, machinery, apparatus, materials, personnel, temporary facilities ready. 2. thethe p ubber injection 2.13 clean ending 2.14 construction Qian prepared 1. Description Project Manager required for the duration ofmeasurement positioning and put line 2.9 cross box installation 2.10 installation 2.11 stone plate installation 2.12 sealed rs box ived pieces installation 2.6 vertical box installation 2.7 vertical box correction and acceptance 2.8 layer high and the crosces processing 2.3 measurement and the measurement results figure draws 2.4 vertical box positioning put line 2.5 turned rece3 图3 解析:由共点力平衡条件可知Fcosθ,mg～Fsinθ,F～所以221 mgF,～F,mgtanθ～故选D. 21cosθ 答案:D 7(一天，下着倾盆大雨(某人乘坐列车时发现，车厢的双层玻璃窗内积水了(列车进站过程中，他发现水面的形状如图中的( ) 解析:列车进站时刹车～速度减小～而水由于惯性仍要保持原来较大的速度～所以水向前涌～液面形状和选项C一致( 答案:C and the measurement results figure draws 2.4 vertical box positioning put line 2.5 turned received pieces installation 2.6 ve tallation job main including following steps: 2.1 construction Qian prepared 2.2 pre buried pieces processing 2.3 measurementhe file size in the appropriate authority inspection departments qualified testing. Stone used steel keel, inssaving performance in front of the construction should be in accordance with the construction plan of the specification and t-rformance and energyce, peerror in 0.5mm stone. Air infiltration properties, stone curtain wall wind pressure rainwater leakage in distortion performanonsent before they can purchase and order under the program, each stone must use the same background, the same pattern, size rs ' cacceptance after the representatives of the party were invited. Requirements: (1) covert acceptance is thetypeset by the ownetion has been collected. Documentation: should follow construction progress at any time finishing self acceptance, signature mpliance requirements. (4) have an impact on other projects. (5) the material used is eligible. (6) complete informarelated. Mainly in the following aspects: (1) acceptance of positioning is accurate. (2) is fixed securely. (3) tightening co-concealed works quality inspection must be carried out according to acceptance of finished products. 8. quality assessment, data compilation: buried, belongs to the concealed works construction, therefore it-intain sanitation. (4) ensure the safety of materials and semithat construction site clean, consciously maproject outline: to understand the site profiles, familiar with the construction and supervision of partyn (1) ormation, tools, machinery, apparatus, materials, personnel, temporary facilities ready. 2. the scope of previous constructio14 construction Qian prepared 1. Description Project Manager required for the duration of the project schedule, technical infing 2.t line 2.9 cross box installation 2.10 installation 2.11 stone plate installation 2.12 sealed rubber injection 2.13 clean endl box installation 2.7 vertical box correction and acceptance 2.8 layer high and the cross box measurement positioning and purtica4 河南教考资源信息网 版权所有?侵权必究 图4 8(如图4所示，质量m的球与弹簧?和水平细线?相连，?、?的另一端分别固定于P、Q两点(球静止时，?中拉力大小为T，1?中拉力大小T，当仅剪断?、?中的一根的瞬间，球的加速度a2 应是( ) A(若断?，则a,g，方向水平向右 T2B(若断?，则a,，方向水平向左 m T2C(若断?，则a,，方向沿?的延长线 m D(若断?，则a,g，方向竖直向上 答案:B 图5 9(如图5所示，三个紧靠在一起的物体A、B、C放在水平地面上，其质量分别为m,5m，m,3m，m,2m，它们与地面间ABC 的动摩擦因数均为μ,0.3.当用水平推力F,5 mg作用在A上，此时， ance is thetypeset by the owners ' consent before they can purchase and order under the program, each stone must use the sameng self acceptance, signature acceptance after the representatives of the party were invited. Requirements: (1) covert acceptinishied is eligible. (6) complete information has been collected. Documentation: should follow construction progress at any time fate. (2) is fixed securely. (3) tightening compliance requirements. (4) have an impact on other projects. (5) the material usrelated. Mainly in the following aspects: (1) acceptance of positioning is accur-ried out according to acceptance of concealed worksessment, data compilation: buried, belongs to the concealed works construction, therefore its quality inspection must be carfinished products. 8. quality as-that construction site clean, consciously maintain sanitation. (4) ensure the safety of materials and semin of partyvisioscope of previous construction (1) project outline: to understand the site profiles, familiar with the construction and super roject schedule, technical information, tools, machinery, apparatus, materials, personnel, temporary facilities ready. 2. thethe p ubber injection 2.13 clean ending 2.14 construction Qian prepared 1. Description Project Manager required for the duration ofmeasurement positioning and put line 2.9 cross box installation 2.10 installation 2.11 stone plate installation 2.12 sealed rs box ived pieces installation 2.6 vertical box installation 2.7 vertical box correction and acceptance 2.8 layer high and the crosces processing 2.3 measurement and the measurement results figure draws 2.4 vertical box positioning put line 2.5 turned reced pietesting. Stone used steel keel, installation job main including following steps: 2.1 construction Qian prepared 2.2 pre burie th the construction plan of the specification and the file size in the appropriate authority inspection departments qualifiedsaving performance in front of the construction should be in accordance wi-eakage in distortion performance, performance and energyround, the same pattern, size error in 0.5mm stone. Air infiltration properties, stone curtain wall wind pressure rainwater lbackg5 B物体受到的合外力等于( ) A(3mg/2 B(3mg/4 C(3mg/5 D(2mg/5 解析:对整体～由牛顿第二定律得 F,μ(m，m，m)g,(m，m，m)a ABCABC 对B 由牛顿第二定律得F,ma 合B 3联立??得:F,mg 合5 答案:C 10(如图6所示，A、B两物体叠放在一起，以相同的初速度上抛(不计空气阻力)。下列说法正确的是( ) 图6 A(在上升和下降过程中A对B的压力一定为零 B(上升过程中A对B的压力大于A物体受到的重力 C(下降过程中A对B的压力大于A物体受到的重力 D(在上升和下降过程中A对B的压力等于A物体受到的重力 解析:本题考查牛顿运动定律的应用——超重和失重的知识(A、B两物体抛出以后处于完全失重状态～无论是上升还是下降～A物体对B物体的压力一定为零～A选项正确( 答案:A 二、填空题(每小题5分，共20分) tallation job main including following steps: 2.1 construction Qian prepared 2.2 pre buried pieces processing 2.3 measurementhe file size in the appropriate authority inspection departments qualified testing. Stone used steel keel, inssaving performance in front of the construction should be in accordance with the construction plan of the specification and t-rformance and energyce, peerror in 0.5mm stone. Air infiltration properties, stone curtain wall wind pressure rainwater leakage in distortion performanonsent before they can purchase and order under the program, each stone must use the same background, the same pattern, size rs ' cacceptance after the representatives of the party were invited. Requirements: (1) covert acceptance is thetypeset by the ownetion has been collected. Documentation: should follow construction progress at any time finishing self acceptance, signature mpliance requirements. (4) have an impact on other projects. (5) the material used is eligible. (6) complete informarelated. Mainly in the following aspects: (1) acceptance of positioning is accurate. (2) is fixed securely. (3) tightening co-concealed works quality inspection must be carried out according to acceptance of finished products. 8. quality assessment, data compilation: buried, belongs to the concealed works construction, therefore it-intain sanitation. (4) ensure the safety of materials and semithat construction site clean, consciously maproject outline: to understand the site profiles, familiar with the construction and supervision of partyn (1) ormation, tools, machinery, apparatus, materials, personnel, temporary facilities ready. 2. the scope of previous constructio14 construction Qian prepared 1. Description Project Manager required for the duration of the project schedule, technical infing 2.t line 2.9 cross box installation 2.10 installation 2.11 stone plate installation 2.12 sealed rubber injection 2.13 clean endl box installation 2.7 vertical box correction and acceptance 2.8 layer high and the cross box measurement positioning and purticaand the measurement results figure draws 2.4 vertical box positioning put line 2.5 turned received pieces installation 2.6 ve6 河南教考资源信息网 版权所有?侵权必究 11(我国是最早掌握卫星回收技术的国家之一，卫星回收舱返回大气层后受到空气阻力作用，先做变减速运动，最后做匀速运动(若 2回收舱质量为m，空气阻力大小与速率的平方成正比，即F,kv，则卫星回收舱的收尾速率为__________((收尾速率即最终匀速运动的速率) 答案:mg/k 12(如图7所示，质量为M的木板放在倾角为θ的光滑斜面上，一个质量为m的人站在木板上，若人相对于木板静止，木板加速度为__________(若木板相对于斜面静止，则人必须以沿斜面向__________，大小为__________的加速度相对木板做匀变速运动( 图7 ，M，m，gsinθ 答案:gsinθ 下 m 13(质量为2 kg的物体在水平面上运动，假设物体与水平面之间的动摩擦因数为0.75，一个大小为15 N的水平力作用于该物体上， 22则加速度的最大值为________m/s，最小值为________m/s.(g取10 2m/s) 解析:当水平力与物体运动方向相反时～加速度最大～设为a. max F2F，μmg,ma～a,，μg,15 m/s. maxmaxm round, the same pattern, size error in 0.5mm stone. Air infiltration properties, stone curtain wall wind pressure rainwater lbackg ance is thetypeset by the owners ' consent before they can purchase and order under the program, each stone must use the sameng self acceptance, signature acceptance after the representatives of the party were invited. Requirements: (1) covert acceptinishied is eligible. (6) complete information has been collected. Documentation: should follow construction progress at any time fate. (2) is fixed securely. (3) tightening compliance requirements. (4) have an impact on other projects. (5) the material usrelated. Mainly in the following aspects: (1) acceptance of positioning is accur-ried out according to acceptance of concealed worksessment, data compilation: buried, belongs to the concealed works construction, therefore its quality inspection must be carfinished products. 8. quality as-that construction site clean, consciously maintain sanitation. (4) ensure the safety of materials and semin of partyvisioscope of previous construction (1) project outline: to understand the site profiles, familiar with the construction and super roject schedule, technical information, tools, machinery, apparatus, materials, personnel, temporary facilities ready. 2. thethe p ubber injection 2.13 clean ending 2.14 construction Qian prepared 1. Description Project Manager required for the duration ofmeasurement positioning and put line 2.9 cross box installation 2.10 installation 2.11 stone plate installation 2.12 sealed rs box ived pieces installation 2.6 vertical box installation 2.7 vertical box correction and acceptance 2.8 layer high and the crosces processing 2.3 measurement and the measurement results figure draws 2.4 vertical box positioning put line 2.5 turned reced pietesting. Stone used steel keel, installation job main including following steps: 2.1 construction Qian prepared 2.2 pre burie th the construction plan of the specification and the file size in the appropriate authority inspection departments qualifiedsaving performance in front of the construction should be in accordance wi-eakage in distortion performance, performance and energy7 当水平力与物体运动方向相同时～加速度最小～设为a. min FF,μmg,ma～a,,μg,0. minminm 答案:15 0 14(一打点计时器固定在斜面上某处，一小车拖着穿过打点计时器的纸带从斜面上滑下，如图8所示，图9是打出的纸带的一段( 图8 图9 (1)已知打点计时器使用的交流电频率为50 Hz，利用图给出的数据可求出小车下滑的加速度a,__________. (2)为了求出小车在下滑过程中所受的阻力，还需要测量的物理量有__________，用测得的量及加速度a示阻力的计算式F,f________. 1解析:(1)T,,0.02 s～ f ，x，x，x，x，,，x，x，x，x，67892345a, 216×，2T， 2,4.00 m/s. (2)设小车的质量为m～斜面上任意两点间距离L及两点间的高 he file size in the appropriate authority inspection departments qualified testing. Stone used steel keel, inssaving performance in front of the construction should be in accordance with the construction plan of the specification and t-rformance and energyce, peerror in 0.5mm stone. Air infiltration properties, stone curtain wall wind pressure rainwater leakage in distortion performanonsent before they can purchase and order under the program, each stone must use the same background, the same pattern, size rs ' cacceptance after the representatives of the party were invited. Requirements: (1) covert acceptance is thetypeset by the ownetion has been collected. Documentation: should follow construction progress at any time finishing self acceptance, signature mpliance requirements. (4) have an impact on other projects. (5) the material used is eligible. (6) complete informarelated. Mainly in the following aspects: (1) acceptance of positioning is accurate. (2) is fixed securely. (3) tightening co-concealed works quality inspection must be carried out according to acceptance of finished products. 8. quality assessment, data compilation: buried, belongs to the concealed works construction, therefore it-intain sanitation. (4) ensure the safety of materials and semithat construction site clean, consciously maproject outline: to understand the site profiles, familiar with the construction and supervision of partyn (1) ormation, tools, machinery, apparatus, materials, personnel, temporary facilities ready. 2. the scope of previous constructio14 construction Qian prepared 1. Description Project Manager required for the duration of the project schedule, technical infing 2.t line 2.9 cross box installation 2.10 installation 2.11 stone plate installation 2.12 sealed rubber injection 2.13 clean endl box installation 2.7 vertical box correction and acceptance 2.8 layer high and the cross box measurement positioning and purticaand the measurement results figure draws 2.4 vertical box positioning put line 2.5 turned received pieces installation 2.6 ve tallation job main including following steps: 2.1 construction Qian prepared 2.2 pre buried pieces processing 2.3 measurement8 河南教考资源信息网 版权所有?侵权必究 h度差h～则F,mg,ma. fL 2答案:(1)4.00 m/s (2)小车质量m～斜面上任意两点间距离L及两点间高度差h hmg,ma. L 三、计算题(共40分) 15((8分)一个质量为m的物体，静止于水平面上，物体与水平面间的动摩擦因数为μ，现用与水平面成θ的力F拉物体(如图10甲所示)，为使物体能沿水平面做匀加速运动，求F的范围( 有一同学的解答如下: 图10 设物体的加速度为a，由图乙得: Fcosθ,μF,ma (1) Fsinθ，F,mg (2) NN 要使物体做匀加速运动，应满足a>0 (3) μmg由(1)(2)(3)得F>. cosθ，μsinθ 请对此解答做出评价，并做出正确的解答( 解析:该同学的解答是错误的( round, the same pattern, size error in 0.5mm stone. Air infiltration properties, stone curtain wall wind pressure rainwater lbackg ance is thetypeset by the owners ' consent before they can purchase and order under the program, each stone must use the sameng self acceptance, signature acceptance after the representatives of the party were invited. Requirements: (1) covert acceptinishied is eligible. (6) complete information has been collected. Documentation: should follow construction progress at any time fate. (2) is fixed securely. (3) tightening compliance requirements. (4) have an impact on other projects. (5) the material usrelated. Mainly in the following aspects: (1) acceptance of positioning is accur-ried out according to acceptance of concealed worksessment, data compilation: buried, belongs to the concealed works construction, therefore its quality inspection must be carfinished products. 8. quality as-that construction site clean, consciously maintain sanitation. (4) ensure the safety of materials and semin of partyvisioscope of previous construction (1) project outline: to understand the site profiles, familiar with the construction and super roject schedule, technical information, tools, machinery, apparatus, materials, personnel, temporary facilities ready. 2. thethe p ubber injection 2.13 clean ending 2.14 construction Qian prepared 1. Description Project Manager required for the duration ofmeasurement positioning and put line 2.9 cross box installation 2.10 installation 2.11 stone plate installation 2.12 sealed rs box ived pieces installation 2.6 vertical box installation 2.7 vertical box correction and acceptance 2.8 layer high and the crosces processing 2.3 measurement and the measurement results figure draws 2.4 vertical box positioning put line 2.5 turned reced pietesting. Stone used steel keel, installation job main including following steps: 2.1 construction Qian prepared 2.2 pre burie th the construction plan of the specification and the file size in the appropriate authority inspection departments qualifiedsaving performance in front of the construction should be in accordance wi-eakage in distortion performance, performance and energy9 原因是只考虑了匀加速的条件～没有考虑到沿水平面运动的条件F?0正确解答如下: N Fcosθ,μF,ma N Fsinθ，F,mg N a>0 F?0 N μmgmg联立得