高一物理必修2知識點總結(完整版)

　　

【正文】 為支持 力） （ 2）當 0v Rg 時， F 隨 v 增大而減小，且 mgF0（ F 為 支持力 ） （ 3）當 v= Rg 時， F=0 （ 4）當 v Rg 時， F 隨 v 增大而增大，且 F0（ F 為 拉力 ） ：行星軌道半長軸的三次方與公轉周期的二次方的比值是一個常量 。 使人造衛星 脫離地球的引力束縛 ，不再繞地球運行，從地球表面發射所需的最小速度。 ： 212KE mv? 動能變化量： 22211122K KKE E E m v m v? ? ? ? ?末 初 ： K KKW E E E? ? ? ?合 末 初 常用變形：1 2 3 nF F F F K KKEWW EW EW ??? ? ? ?末 初 ： 在只有重力或彈力做功的物體系統內，動能和勢能會發生相互轉化，但機械能的總量保持不變。s 18 and the eighth session of the third, the spirit of the fourth plenary session, reflecting the experience of studying and implementing the General Secretary Xi Jinping series of important speech, reflects the party39。s ideals and beliefs, excellent traditional style. The revised the code closely linked to the selfdiscipline, insisting on the positive initiative, for all members, highlight the vital few, emphasized selfdiscipline, focusing on the morality, and the majority of Party members and the ideological and moral standards. The revised Ji method separately, Ji, Ji Yan to Method, as a negative list, emphasizing the heteronomy, focusing on vertical gauge. Is this one high and one low, a positive reaction, the strict party discipline and practice results transformation for the integration of the whole party to observe moral and discipline requirements, for the majority of Party members and cadres provides benchmarking and ruler. Third, insist on to. In view of the problems existing in the 15 party at the present stage, the main problems of Party members and cadres in the aspect of selfdiscipline and abide by the discipline to make clearly defined, especially the party39。s basic theory, basic line, basic program and basic experience, the basic requirement of behavior made prescribed punishment, increase the cliques, against the anization such as violation of the provisions, to ensure that the central government decrees and the Party of centralized and unified. 3, adhere to strict discipline in the law and discipline In front, Ji separated. Revised Regulations adhere to the problem oriented, do Ji separated. Any national law existing content, will not repeat the provisions, the total removal of 79 and criminal law, repeat the content of the public security management punishment law, and other laws and regulations. In the general reiterated that party anizations and Party members must conscientiously accept the party39。s interests, we should depend on the situation 23 Seriousness given disciplinary action. The loss of Party members, seriously damaging the party39。s Procuratorate shall make a decision not to initiate a prosecution, or the people39。 at the same time, to investigate violations of Party members and even criminal behavior of Party discipline and responsibility, Regulations distinguish five different conditions, with special provisions were made provisions, so as to realize the connection of Party discipline and state law. 4, reflect Wind building and anticorruption 20 struggle of the latest achievements. rule the party39。s solemn mitment. criterion of a clean and honest administration consists of 4 parts, 18, more than 3600 words. After the revision of the code , a total of eight, 281 words, including lead, specification and Party member cadre clean fingered selfdiscipline norms, etc. Part 3 members lowcost clean and selfdiscipline, the main contents can be summarized as four must eight code. Lead part, reiterated on ideal and faith, fundamental purpose, the fine traditions and work style, noble sentiments, such as four must the principle of requirements, strong tone of selfdiscipline, The higher request for 6 and 17 supervised te, the foothold in permanent Bao the party39。 the second is concisely positive advocated by the lack of prohibited provisions excessive, no autonomy requirements。 rule around the party discipline, disciplinary ruler requirements, listed as negative list, focusing on vertical gauge, draw the party anizations and Party members do not touch the bottom line . Here, the main from four square face two party rules of interpretation: the first part introduces two party Revised regulations the necessity and the revision process。 使人造衛星 掙脫太陽引力的束縛 ，飛到太陽系以外的宇宙空間去，從地球表面發射所需要的最小速度。 22G M m m g G M gRR ? ? ?(黃金代換 ) h 的重力加速度：? ? ? ? ? ?222G M m G Mm g G M g R h gR h R h? ? ?? ? ? ? ? ??? ：萬有引力提供向心力 2GMmFFr??萬 向 22G M m G Mm a arr? ? ? （軌道處的 向心加速度 a 等于軌道處的 重力加速度 g軌 ） 22G M m v G Mmvr r r? ? ? 6 223G M m G Mmrrr??? ? ? 2 232 24G M m rm r Tr T G M????? ? ????? ： 方法 1： 22 gRGM gR MG? ? ? （已知 R 和 g） 方法 2： 2GM v rvMrG? ? ? （已知衛星的 V 與 r） 方法 3： 233GM rMrG?? ? ? ? （已知衛星的 ? 與 r） 方法 4： 2 3 2 3244rrTMG M G T??? ? ? （已知衛星的周期 T 與 r） 方法 5：已知323 24GMvr vTMGrTGM??? ??????? ??? （已知衛星的 V 與 T） 方法 6：已知33GMvvr MGGMr??? ??? ???? ??? （已知衛星的 V 與 ? ，相當于已知 V 與 T） ： 球的體積公式： 343VR?? 2233232322() 3434 rM M rRVmMGmG T RrrGTTM? ?? ????????? ?????? 近地衛星23GT??? (r=R) 8. 發射速度： 采用多級火箭發射衛星時，衛星 脫離 最后一級火箭時的速度 。 2 22sv r r fr n rtT ?? ? ??? ? ? ? ?? 單位：米 /秒， m/s ： 質點所在的半徑轉過的角度跟所用時間的比值。 最短位移為： minxd? 合速度為： 22sinv v v v?? ? ?合 船 船 水 對應的時間為： dtv?合 例 2:一艘小 船在 200m 寬的河中橫渡到對岸，已知水流速度是 5m/s，小船在靜水中的速度是 4m/s， 求：（ 1）欲使船渡河時間最短，船應該怎樣渡河？最短時間是多少？船經過的位移多大？ 3 （ 2）欲使航行位移最短，船應該怎樣渡河？最短位移是多少？渡河時間多長？ 解： （ 1） 結論：欲使船渡河時間最短，船頭的方向應該垂直于河岸。 ③ 當合力方向與速度方向 垂直 時，物體的速率 不變 。 2．物體做曲線運動的條件 (1)從動力學角度看：物體所受 合外力 方向跟它的 速度方向 不在同一條直線上 。 （ 2）由于運動的 速度方向 總沿軌跡的 切線方向 ，又由于曲線運動的軌跡是曲線，所以曲線運動的 速度方向 時刻變化。 也可以說是：合外力不變的運動。 方法： 把合速度分解為 沿繩方向 和 垂直于繩方向 。 相關結論： 22m inm inc ossinc ossinACvvv v v vdvdxxvx dttvv?????????? ? ???