机械运动的图像分析.ppt

单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,*,机械运动的图像分析,机械运动路程,-,速度,-,时间关系图,明德洞井中学,:,李栖梧,已知某小汽车在平直的公路上在任意相同的时间内通过的路程如下图所示，则该汽车做什么运动？,时间,t (S)0,10,20,30,40,路程,S (m)0,300,600,900,1200,O,.,.,.,.,.,.,.,.,.,t/s,S/m,时间,t (S)0,10,20,30,40,路程,S (m)0,300,600,900,1200,时间,t (S)0,10,20,30,40,路程,S (m)0,300,600,900,1200,O,.,.,.,.,.,.,.,.,.,t/s,S/m,10,20,30,40,50,300,600,900,1200,.,.,.,.,时间,t (S)0,10,20,30,40,路程,S (m)0,300,600,900,1200,O,.,.,.,.,.,.,.,.,.,t/s,S/m,10,20,30,40,50,300,600,900,1200,.,.,.,.,O,.,.,.,.,.,.,.,.,.,t/s,S/m,10,20,30,40,50,300,600,900,1200,.,.,.,.,.,.,1,2,.,2,号对应的运动,?,O,.,.,.,.,.,.,.,.,t/s,S/m,10,20,30,40,50,300,600,900,1200,.,.,.,.,.,.,1,.,.,.,.,.,A,B,.,.,.,.,.,C D,.,.,.,.,2,号对应的运动？,2,O,.,.,.,.,.,.,.,.,.,t/s,S/m,10,20,30,40,50,300,600,900,1200,.,.,.,.,1,3,.,3,号对应的运动方式？,4,4,号对应的运动方式？,O,.,.,.,.,.,.,.,.,.,t/s,S/m,10,20,30,40,50,300,600,900,1200,怎样将该小车的,路程,-,时间图像,转换为速度,-,时间,图像呢？,O,t/s,v,（,m/s,）,10,20,30,40,50,10,20,40,O,.,.,.,.,.,.,.,.,.,t/s,v,（,m/s,）,30,O,.,.,.,.,.,.,.,.,.,t/s,S/m,10,20,30,40,50,300,600,900,1200,若小汽车为静止状态怎样在图像中表达？,活动：某学习小组对一辆在平直公路上做直线运动的小车进行观测研究。他们记录并绘制了相应的路程,时间图像（,s-t,图），,你能从该图像中获得各段的运动方式吗？任意段的平均速度，全程的平均速度？,（,1,）,_,（,2,）,_,（,3,）,_,o,t,/s,s,/m,2,2,4,4,6,6,8,o,t,（,s,）,S(,m,),2,2,4,4,6,6,8,思考：此题若换成,v-t,图答案又如何？,结束,课后探究：,一位同学从家里出发到学校，在前一半路程内速度为,20m/s,，后一半路程内速度为,30m/s,，求其在全程的平均速度。,