高一物理必修2知識點總結-文庫吧在線文庫

　　

【正文】 elopment of the situation, which many provisions have been unable to fully meet the prehensive strictly administering the practice needs. One is Ji law, more than half of the provisions and criminal law and other countries laws and regulations Repetition。 the third part introduces two party regulations modified the main changes and needs to grasp several key problems。 cosW Fx ?? 1 2 3 c o snF F F FW W W W W F x ?? ? ? ?合 合 2. 計算平均功率： PvWtPF??? ????? 計算瞬時功率： P F v??瞬 瞬 cosP F v ?? ? ? （ 力 F 的方向與速度 v 的方向夾角α ） 3. 重力勢能： PE mgh? 重力做功計算公式： 12G PPW m g h m g h E E? ? ? ?初 末 重力勢能變化量： 21P PPE E E m g h m g h? ? ? ? ?末 初 重力做功與重力勢能變化 量之間的關系： GPWE??? 重力做功特點：重力做 正功 (A到 B)，重力勢能 減小 。 第一宇宙速度 (環(huán)繞速度）： 。 22rT v????? 單位：秒， s ： 單位 時間內完成圓周運動的圈數。 如 左圖 所示： AC 即為所求的合速度方向。對應的是 合速度 。 3． 勻變速運動： 加速度（大小和方向）不變的運動。 1 高一物理下知識點總結 1．曲線運動的特征 （ 1）曲線運動的軌跡是 曲線 。 (2)從運動學角度看：物體的 加速度 方向 跟它的 速度方向 不在同一條直線上 。（ 舉例： 勻速圓周運動） 合 運動 ： 實際的運動。 渡河的 最短時間 為： min dt v船＝ 合速度為： 22v v v??合 船 水 合 位移為： 2 2 2 2()A B B Cx x x d v t? ? ? ? 水 或者 x v t??合 （ 2） 方法： 以水速的末端點為圓心，以船速的大小為半徑做圓，過水速的初端點做圓的切線，切線即為所求合速度方向。 2 22fntT??? ? ??? ? ? ?? 單位：弧度 /秒， rad/s ： 物體 做 勻速圓周運動一周所用的時間。 運行速度： 是指衛(wèi)星在進入運行軌道后繞地球做勻速圓周運動時的線速度．當衛(wèi)星 “貼著 ” 地面運行時，運行速度等于 第一宇宙速度 。 7 。 the second part is the interpretation of the two fundamental principles of the revision of laws and regulations in the party。 the third is banned terms and discipline law, both with the party discipline, disciplinary regulations repeat and Criminal law and other laws and regulations repeat。s advanced nature and purity, to reflect the revised standards requirements. Members of selfdiscipline norms around the party members how to correctly treat and deal with the public and private, cheap and rot thrifty and extravagance bitter music, put forward the four norms. Party leader cadre clean fingered selfdiscipline norms for the leadership of the party members and cadres of the vital few, around the clean politics, from civil servant of the color, the exercise of power, moral integrity, a good family tradition and other aspects of the leadership of the party members and cadres of the four norms norm norm. The Party member39。s eighteen years implement the spirit of the central provisions of the eight, against the requirements of the four winds and transformation for disciplinary provisions, reflecting the style construction is always on the road, not a gust of wind. In the fight against corruption out of new problems, increase the trading rights, the use of authority relatives profit and other disciplinary terms. Prominent discipline of the masses, the new against the interests of the masses and ignore the demands of the masses and other disciplinary terms and make provisions of the disposition and the destruction of the party39。s court shall make a conviction and exempted from criminal punishment shall be given within the party is removed from his post, probation or expelled from the party. Party members and crime, sheets were fined in accordance with For acts。s image, the damage to the party, the state and the people39。s leadership and the party39。s eighteen, ten eight plenary, the spirit of the Fourth Plenary Session of the Eleventh Central Committee and General Secretary Xi Jinping important instructions on the revised low political criterion and Regulations , highlighting the ruling party characteristics, serious discipline, the discipline quite in front of the law, based on the current, a longterm, advance as a whole, with Bu Xiuding independent rule and rule . Main principle is: first, adhere to the party constitution to follow. The constitution about discipline and selfdiscipline required specific, awaken the party constitution of party passes party consciousness, maintaining the authority of the constitution. General Secretary Xi Jinping pointed out that no rules, no side round. Party constitution is the fundamental law, the party must follow the general rules. In early 2020 held the eighth session of the Central Commission for Discipline Inspection Fifth Plenary Session of the 16th Central Committee, Xi Jinping again pointed out that constitution is the party must follow the general rules, but also the general rules. the revision of the 14 code and rule is Method in adhere to the regulations established for the purpose of bining rule of virtue is to adhere to the party constitution as a fundamental to follow, the constitution authority set up, wake up the party constitution and party rules the sense of discipline, the party constitution about discipline and selfdiscipline specific requirements. 4 second is to adhere to in accordance with the regulations governing the party and the party. The Party of rule of virtue de, mainly refers to the party39。s leadership, to solve the masses of the people reflect a focus on the problem. The new revision of the code and rule , reflects the party39。彈力對物體做 負功 ，彈性勢能 增加 。 第二宇宙速度 （脫離速度）： 。 繩模型 5 （ 注意： 繩對小球只能產生 拉力 ） （ 1）小球能過最高點的臨界條件：繩子和軌道對小球剛好沒有力的作用 mg = 2vmR ? v臨 界 = Rg （ 2）小球 能過最高點條件： v ≥ Rg （當 v Rg 時，繩對球產生拉力，軌道對球產生壓力） （ 3）不能過最高點條件： v Rg （實際上球還沒有到最高點時，就脫離了軌道） ２．“桿模型”，小球在豎直平面內做圓周運動過最高點情況 （ 注意： 輕桿和細線不同，輕桿對小球既能產生 拉力 ，又能產生 推力 。 瞬時 速度 方向的反向延長線與初速度 方向 延長線的交點到拋出點的距離都等于水平位移的一半。 m inco sddttvv?? ? ?船 船 （此時 ? =0176。 （ 2） 合力的效果：合力沿 切線方向 的分力 F2改變 速度的大小 ，沿 徑 向的分力 F1改變速度的 方向 。 （ 3）由于曲線運動 的 速度一定是變化的 ，至少其 方向 總是不斷變化的，所以，做曲線運動的物體的中 速度必不為零 ，所受到的 合外力必不為零 ，必定有 加速度 。 （注意：合外力為 零 只有 兩 種狀態(tài)：靜止和勻速直線運動。 ① 當合力方向與速度方向的夾角為 銳角 時，物體的速率將 增大 。即 船頭的方向應該垂直于河岸 ） 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。 （ A 是 OB 的中點）。） （ 1）小球能過最高點的臨界條件： v=0， F=mg （ F