推荐回答(3个)
在v-t图中可以得到和求到(1)物体的瞬时速度(2)运动
方向(速度值的正负)(3)运动状态(V=0时物体静止,V
为!=0定值时物体匀速运动,图像为斜直线时物体匀加
速运动,图像为曲线时物体变加速运动)(4)某一时间段
内的平均速度(5)用面积求得路程(6)物体在某一点的
切线的斜率就是其在该点对应时刻的加速度
在s-t图中可以得到和求到(1)物体的运动方向(S值的
正负)(2)运动状态(S值不变时物体静止,图像为斜直线
时物体匀速运动,图像为抛物线时物体加速运动)(3)物
体在某一点的切线的斜率就是其在该点对应时刻的瞬
时速度(4)某一时间段内的平均速度 (5)连续相同时间
段位移比, 连续相同位移段时间比
还有好些,你得自己具体遇到时具体分析
你要搞清楚书安排内容的用意,先学的是概念,其中就有位移、时间,第二节就学位移-时间的关系,学完第三节就安排了一个S-T图,他表示的就是位移随时间的变化规律。接下来又学了表示物体位移变化(位置变化)快慢的物理-速度,再下来又叫他与时间的有关系,随后又安排一个V-T来解释。说明V-T是描述速度与时间的关系的。最后学习速度变化快慢的物理理-加速度,但高中再没安排其与时间的关系了,因为高中只要求掌握匀变速运动。
至于两图,你首先要关心的是纵坐标的物理量到底是S还是V。如果是S就用S-T图的规律从速度大小,方向,位移大小,方向进行认识,如果是V,也从速度大小、方向,位移大小、方向进行认识。另外重点关心两图的斜率,ST图的斜率是物理的速度,正斜率表示物理朝正方向运动。反之则反之;ST图的斜率表示物体的加速度大小。正斜率表示物理朝正方向增加速度(注意,不是朝正方向运动),反之则反之。懂了吗?
首先更正:v-t图象利用面积求的是位移!
s-t图象:①如果是倾斜的直线的话说明物理做的是匀速直线运动,若平行于时间轴的话则物理静止;②利用直线斜率比较速率大小,斜率越大速率越大。
v-t图象:①求位移②如果是倾斜的直线的话说明物理做的是匀变速直线运动(斜向上则a>0,斜向下则a<0),若平行于时间轴的话则是匀速直线运动③利用斜率比较加速度大小,斜率越大加速度越大
关于a的图象在高中比较少出现
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