ideological and theoretical qualities and practical working ability, and strive to build a contingent of league cadres with positive work style and high quality. Hold a regular meting of the party secretary every fortnightly, arrange the work of the regiment, fedback the student information. Focus on training junior high school, junior high school secretary of the regiment branch to enable them to raise A firm political conviction, diligent and diligent learning spirit and practical and innovative work style.运动和力一.力和运动的关系二．例题专练例 1、关于足球受力与运动的关系，下列说法正确的是 A．足球只有受力才能运动 B．足球受平衡力，一定处于静止状态 C．足球的运动状态改变，不一定受力 D．足球踢出后继续运动，是由于足球具有惯性 例 2、李明同学在学习运动和力的知识后有以下理解，其中正确的是 A．投球时，手的推力使篮球在空中继续飞行B．静止在地上的足球一定受到平衡力的作用C．用力推小车，小车没动，因为推力小于摩擦力D．假如运动的物体不受力，它将慢慢停下来例 3、在太空中飞行的宇宙飞船，假如它受到的一切外力消逝，那么宇宙飞船将 A．立即静止 B．减速飞行 C．加速飞行 D．匀速飞行例 4、空中匀速下降的两只降落伞，其总质量相等。甲的速度是3m/s，乙的速度是 5m/s，所受阻力 F 甲、F 乙之比是 A. 1:1 B.2:5 C. 3:5 D. 5:3例 5、滑块被固定在光滑斜面底端的压缩弹簧弹出。滑块离开弹簧后沿斜面对上运动的过程中，不考虑空气阻力，下图关于滑块的受力示意图正确的是例 6、若小球在运动过程中只受到力 F 的作用，且运动过程中力 F 始Strengthen the team connection, strengthen the knowledge education among the students (especially the first grade students), and promote the formation of good school spirit with the influence of the league members. All League branches should start with recommending outstanding students as the development objects of the League, take amateur league schools as the basis, conscientiously do a good job in the work of pre-league ...
