高一物理期中必备知识点平抛运动公式
1。水平方向速度:Vx=Vo 2。竖直方向速度:Vy=gt
3。水平方向位移:x=Vot 4。竖直方向位移:y=gt2/2
5。运动时间t=(2y/g)1/2(通常又表示为(2h/g)1/2)
6。合速度Vt=(Vx2+Vy2)1/2=[Vo2+(gt)2]1/2合速度方向与水平夹角beta高考;:tg=Vy/Vx=gt/V0
7。合位移:s=(x2+y2)1/2,位移方向与水平夹角:tg=y/x=gt/2Vo
8。水平方向加速度:ax=0;竖直方向加速度:ay=g
注:
(1)平抛运动是匀变速曲线运动,加速度为g,通常可看作是水平方向的.匀速直线运与竖直方向的自由落体运动的合成;
(2)运动时间由下落高度h(y)决定与水平抛出速度无关;
(3)与的关系为tg=2tg
(4)在平抛运动中时间t是解题关键;
(5)做曲线运动的物体必有加速度,当速度方向与所受合力(加速度)方向不在同一直线上时,物体做曲线运动。
高一第二学期物理期中必备知识点就为大家介绍到这里,希望对你有所帮助。
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