020斜抛运动及类斜抛运动模型 精讲精练-2022届高三物理一轮复习疑难突破微专题
020斜抛运动及类斜抛运动模型专题一.必备知识和方法(一)斜抛运动1.定义:将物体以初速度v0斜向上方或斜向下方抛出,物体只在重力作用下的运动.2.性质:斜抛运动是加速度为g的匀变速曲线运动,运动轨迹是抛物线.3.研究方法:运动的合成与分解(1)水平方向:匀速直线运动;(2)竖直方向:匀变速直线运动.4.基本规律(以斜上抛运动为例,如图所示)(1)水平方向:v0x=v0cosθ,F合x=0;x=v0tcosθ(2)竖直方向:v0y=v0sinθ,F合y=mg;y=v0tsinθ-gt2。也可根据需要,为便于解决问题,沿其它方向建立平面直角坐标系(见下面例1)(二)类斜抛运动在恒力(非重力)作用...
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